How is sid related to exposure rate and radiographic density?
1 Show Focal-spot blur is greatest B. 2 Accurate operation of the AEC device depends on D. 3 An x-ray exposure of a particular part is made and restricted to a 14 x 17 in. field size. The same exposure is repeated, but the x-ray beam is restricted to a 4 x 4 in. field. Compared with the first image, the second image will demonstrate B. 4 If a particular grid has lead strips 0.40 mm thick, 4.0 mm high, and 0.25 mm apart, what is its grid ratio? D. 5 An exposure was made at 40-in. SID using 5 mAs and 105 kVp with an 8:1 grid. In an effort to improve radiographic contrast, the image is repeated using a 12:1 grid and 90 kVp. Which of the following exposure times will be most appropriate, using 400 mA, to maintain the original density? B. 6 Compared with slow-speed screens, high-speed screens are often used to B. 7 Which of the following technical changes would best serve to remedy the effect of very dissimilar tissue densities? C. 8 Tree-like branching black marks on a radiograph are usually the result of D. 9 Recorded detail depends on all the following except A. 10 The exposure factors of 300 mA, 0.017 second, and 72 kVp produce an mAs value of A. 11 In which of the following examinations would a cassette front with very low absorption properties be especially desirable? C. 12 An exposure was made at a 36-in. SID using 300 mA, a 30-ms exposure, and 80 kV with a 400-speed film–screen combination and an 8:1 grid. It is desired to repeat the radiograph and, in order to improve recorded detail, to use a 40-in. SID and a 200-speed film–screen combination. With all other factors remaining constant, what exposure time will be required to maintain the original radiographic density? B. 13 Involuntary motion can be caused by D. 14 A satisfactory radiograph was made using a 36-in. SID, 12 mAs, and a 12:1 grid. If the examination will be repeated at a distance of 42 in. and using a 5:1 grid, what should be the new milliampere-seconds value to maintain the original density? B. 15 A satisfactory radiograph was made using a 40-inch SID, 10 mAs, and a 12:1 grid. If the examination will be repeated at a distance of 48 inches and using an 8:1 grid, what should be the new mAs to maintain the original density? C. 16 If a 6-in. OID is introduced during a particular radiographic examination, what change in SID will be necessary to overcome objectionable magnification? D. 17 Angulation of the central ray may be required D. 18 Types of moving grid mechanisms include B. 19 What is the best way to reduce magnification distortion? C. 20 The factors that control recorded detail include B. 21 Which of the following groups of exposure factors will produce the shortest scale of contrast? B. 22 Characteristics of high-ratio focused grids, compared with lower-ratio grids, include which of the following? C. 23 A part whose width is 6 inches will be imaged at 44 inches SID. The part to be imaged lies 9 inches from the IR. What will be the projected image width of the part? A. 24 Geometric unsharpness is influenced by which of the following? D. 25 Which of the following will influence recorded detail? D. 26 All the following are related to recorded detail except A. 27 The exposure factors of 400 mA, 70 ms, and 78 kV were used to produce a particular radiographic density and contrast. A similar radiograph can be produced using 500 mA, 90 kV, and B. 28 Which of the following terms is used to express resolution/recorded detail? B. 29 A radiograph exposed using a 12:1 ratio grid may exhibit a loss of density at its lateral edges because the A. 30 Characteristics of low ratio focused grids include the following: B. 31 Which of the following terms refers to light being reflected from one intensifying screen, through the film, to the opposite emulsion and intensifying screen? B. 32 Shape distortion is influenced by the relationship between the D. 33 The sensitometric curve may be used to B. 34 Which of the following units is (are) used to express resolution? B. 35 The fact that x-ray intensity across the primary beam can vary as much as 45% describes the C. 36 An exposure was made using 300 mA, 40 ms exposure, and 85 kV. Each of the following changes will decrease the radiographic density by one half except a change to C. 37 Which of the following is the factor of choice for the regulation of radiographic (optical) density? B. 38 Exposure factors of 90 kVp and 4 mAs are used for a particular nongrid exposure. What should be the new mAs if an 8:1 grid is added? C. 39 The interaction between x-ray photons and matter illustrated in Figure 4–22 is most likely to be associated with A. 40 A decrease in kilovoltage will result in A. 41 Using a short (25–30 in.) SID with a large (14 x 17 in.) IR is likely to B. 42 When blue-emitting rare earth screens are matched properly with the correct film emulsion, what type of safelight should be used in the darkroom? B. 43 The reduction in x-ray photon intensity as the photon passes through material is termed C. 44 A radiograph made using 300 mA, 0.1 second, and 75 kVp exhibits motion unsharpness, but otherwise satisfactory technical quality. The radiograph will be repeated using a shorter exposure time. Using 86 kV and 500 mA, what should be the new exposure time? C. 45 With milliamperage adjusted to produce equal exposures, all the following statements are true except B. 46 Which of the following terms is used to describe unsharp edges of tiny radiographic details? C. 47 Focusing distance is associated with which of the following? D. 48 Phosphors classified as rare earth include B. 49 Greater latitude is available to the radiographer when using B. 50 The relationship between the height of a grid's lead strips and the distance between them is referred to as grid A. 51 Exposure factors of 400 mA, 20 ms, 68 kVp, 400-speed system, at 40-in. SID were used to produce a satisfactory radiographic image. A change to 4 mAs can be best compensated for by which of the following? D. 52 Exposure rate increases with an increase in B. 53 Of the following groups of technical factors, which will produce the greatest radiographic density? B. 54 Radiographic contrast is the result of B. 55 X-ray photon energy is inversely related to A. 56 A lateral radiograph of the lumbar spine was made using 200 mA, 1-second exposure, and 90 kV. If the exposure factors were changed to 200 mA, 0.5 second, and 104 kV, there would be an obvious change in which of the following? B. 57 If the center photocell were selected for a lateral projection of the lumbar spine that was positioned with the spinous processes instead of the vertebral bodies centered to the grid, how would the resulting radiograph look? A. 58 Conditions contributing to poor radiographic film archival quality include D. 59 Geometric unsharpness is most likely to be greater D. 60 A 5-in. object to be radiographed at a 44-in. SID lies 6 in. from the IR. What will be the image width? B. 61 Disadvantages of using low-kilovoltage technical factors include D. 62 What pixel size has a 1024 x 1024 matrix with a 35-cm FOV? B. 63 Which combination of exposure factors most likely will contribute to producing the shortest-scale contrast? D. 64 Which of the following will produce the greatest distortion? C. 65 Terms that refer to size distortion include A. 66 The exposure factors used for a particular nongrid x-ray image were 300 mA, 4 ms, and 90 kV. Another image, using an 8:1 grid, is requested. Which of the following groups of factors is most appropriate? B. 67 Figure 4–19 is representative of A. 68 Which of the following is (are) characteristic(s) of a 16:1 grid? B. 69 In which of the following ways can higher radiographic contrast be obtained in abdominal radiography? D. 70 The line-focus principle expresses the relationship between A. 71 An increase from 78 to 92 kVp will result in an increase in which of the following? D. 72 Using fixed milliampere-seconds and variable kilovoltage technical factors, each centimeter increase in patient thickness requires what adjustment in kilovoltage? A. 73 An exposure was made using 600 mA and 18 ms. If the mA is changed to 400, which of the following exposure times would most closely approximate the original radiographic density? C. 74 What pixel size has a 2048 x 2048 matrix with an 80-cm FOV? D. 75 In electronic imaging, as digital image matrix size increases A. 76 Which of the following would be appropriate cassette front material(s)? C. 77 OID is related to recorded detail in which of the following ways? B. 78 In an AP abdomen radiograph taken at 105-cm SID during an IVU series, one renal shadow measures 9 cm in width. If the OID is 18 cm, what is the actual width of the kidney? B. 79 If 32 mAs and 50-speed screens were used to produce a particular radiographic density, what new mAs value would be required to produce the same density if the screen speed were changed to 400? A. 80 Which of the following pathologic conditions would require an increase in exposure factors? D. 81 Which of the following is (are) associated with subject contrast? D. 82 If 300 mA has been selected for a particular exposure, what exposure time would be required to produce 60 mAs? D. 83 According to the line-focus principle, an anode with a small angle provides A. 84 Low-kilovoltage exposure factors usually are indicated for radiographic examinations using B. 85 What grid ratio is represented in Figure 4–8? C. 86 A part whose width is 6 inches will be imaged at 44 inches SID. The part to be imaged lies 9 inches from the IR. What will be the magnification factor? A. 87 Which of the following is (are) characteristic(s) of a 5:1 grid? A. 88 The microswitch for controlling the amount of replenishment used in an automatic processor is located at the C. 89 A 15% increase in kVp accompanied by a 50% decrease in mAs will result in a(n) B. 90 A dry laser printer is generally used when it is necessary to print digital images on film. This laser film is loaded under the following conditions A. 91 Which of the following pathologic conditions would require an increase in exposure factors? D. 92 What should be done to correct for magnification when using air-gap technique? D. 93 In amorphous selenium flat-panel detectors, the term amorphous refers to a B. 94 What pixel size has a 2,048 x 2,048 matrix with a 60-cm FOV? A. 95 An x-ray image of the ankle was made at 40-SID, 200 mA, 50 ms, 70 kV, 0.6 mm focal spot, and minimal OID. Which of the following modifications would result in the greatest increase in magnification? D. 96 Which of the following adult radiographic examinations usually require(s) use of a grid? D. 97 A particular radiograph was produced using 6 mAs and 110 kVp with an 8:1 ratio grid. The radiograph is to be repeated using a 16:1 ratio grid. What should be the new mAs? C. 98 If 92 kV and 12 mAs were used for a particular abdominal exposure with single-phase equipment, what mAs would be required to produce a similar radiograph with three-phase, six-pulse equipment? C. 99 Which of the following factors impact(s) recorded detail? D. 100 Recommended method(s) of minimizing motion unsharpness include D. 101 Recommended method(s) of minimizing motion unsharpness include D. 102 Geometric unsharpness will be least obvious D. 103 If a radiograph were made of an average-size knee using automatic exposure control (AEC) and all three photocells were selected, the resulting radiograph would demonstrate B. 104 Which of the following groups of exposure factors would be most appropriate to control involuntary motion? C. 105 An exposure was made using 300 mA and 50 ms. If the exposure time is changed to 22 ms, which of the following milliamperage selections would most closely approximate the original radiographic density? D. 106 If a 4-inch collimated field is changed to a 14-inch collimated field, with no other changes, the radiographic image will possess A. 107 Which of the following absorbers has the highest attenuation coefficient? A. 108 An exposure was made using 600 mA, 0.04-s exposure, and 85 kVp. Each of the following changes will serve to decrease the radiographic density by one-half except change to C. 109 Which of the following examinations might require the use of 120 kVp? D. 110 The radiograph of the pelvis shown in Figure 6–7 is unacceptable because of C. 111 Which of the following is most likely to produce a radiograph with a long scale of contrast? A. 112 As grid ratio is decreased, A. 113 Which of the following will contribute to the production of longer-scale radiographic contrast? C. 114 A decrease from 90 to 77 kVp will result in a decrease in which of the following? C. 115 Shape distortion is influenced by the relationship between the D. 116 Which of the following groups of technical factors will produce the least radiographic density? D. 117 Which of the lines indicated in Figure 4–2 represents the dynamic range offered by computed radiography/digital radiography (CR/DR)? A. 118 The variation in photon distribution between the anode and cathode ends of the x-ray tube is known as B. 119 The exposure factors of 300 mA, 0.07 second, and 95 kVp were used to produce a particular radiographic density and contrast. A similar radiograph can be produced using 500 mA, 80 kVp, and C. 120 The term differential absorption is related to C. 121 All the following have an impact on radiographic contrast except D. 122 Exposures less than the minimum response time of an AEC may be required when B. 123 If a radiograph exhibits insufficient density, this might be attributed to C. 124 Which of the following is (are) characteristic(s) of a 16:1 grid? D. 125 A 3-inch object to be radiographed at a 36-inch SID lies 4 inches from the image recorder. What will be the image width? B. 126 An overall image density arising from factors other than the light or radiation used to expose the image is called A. 127 How would the introduction of a 6-in. OID affect image contrast? A. 128 A grid is usually employed C. 129 The interaction between x-ray photons and matter illustrated in the figure below is most likely to occur C. 130 Why is a very short exposure time essential in chest radiography? C. 131 Recorded detail is directly related to A. 132 If a radiograph exposed using a 12:1 ratio grid exhibits a loss of density at its lateral edges, it is probably because the A. 133 Which of the following groups of exposure factors will produce the shortest scale of contrast? A. 134 Changes in milliampere-seconds can affect all the following except D. 135 Which of the following combinations is most likely to be associated with quantum mottle? C. 136 An increase in kilovoltage will serve to A. 137 Which of the following conditions would require an increase in exposure factors? B. 138 Compared to a low ratio grid, a high ratio grid will B. 139 The quantity of scattered radiation reaching the IR can be reduced through the use of C. 140 How are mAs and radiographic density related in the process of image formation? B. 141 During film–screen imaging, the manifest image is formed B. 142 Which of the following groups of exposure factors will produce the most radiographic density? C. 143 The absorption of useful radiation by a grid is called C. 144 Geometric unsharpness is directly influenced by A. 145 The appearance of underexposure on an image created using a high-speed film–screen system can be caused by all the following except C. 146 To be suitable for use in intensifying screens, a phosphor should have which of the following characteristics? D. 147 Which of the following pathologic conditions are considered additive conditions with respect to selection of exposure factors? D. 148 Using a 48-in. SID, how much OID must be introduced to magnify an object two times? D. 149 Exposure rate will decrease with an increase in A. 150 An increase in kilovoltage will have which of the following effects? B. 151 For which of the following examinations might the use of a grid not be necessary in an adult patient? B. 152 Which of the following groups of technical factors would be most appropriate for the radiographic examination shown in Figure 4–30? A. 153 The primary source of scattered radiation is the A. 154 The best way to control voluntary motion is B. 155 A particular milliampere-seconds value, regardless of the combination of milliamperes and time, will reproduce the same radiographic density. This is a statement of the C. 156 The radiographic accessory used to measure the thickness of body parts in order to determine optimal selection of exposure factors is the B. 157 An exposure was made at a 36-in. SID using 12 mAs and 75 kVp with a 400-speed imaging system and an 8:1 grid. A second radiograph is requested with improved recorded detail. Which of the following groups of technical factors will best accomplish this task? C. 158 Which of the following has the greatest effect on radiographic density? C. 159 To produce a just perceptible increase in radiographic density, the radiographer must increase the A. 160 How is SID related to exposure rate and radiographic density? D. 161 All the following are related to recorded detail except D. 162 The radiographic accessory used to measure the thickness of body parts in order to determine optimum selection of exposure factors is the B. 163 Which of the following will result if developer replenishment is inadequate? B. 164 A focal-spot size of 0.3 mm or smaller is essential for B. 165 Exposure factors of 80 kVp and 8 mAs are used for a particular nongrid exposure. What should be the new milliampere-seconds value if an 8:1 grid is added? C. 166 All the following affect the exposure rate of the primary beam except D. 167 Decreasing field size from 14 x 17 in. to 8 x 10 in., with no other changes, will A. 168 Which of the following contribute to the radiographic contrast present in the finished radiograph? D. 169 Compared with a low-ratio grid, a high-ratio grid will C. 170 A grid usually is employed in which of the following circumstances? C. 171 A graphic diagram of signal values representing various densities within the part being imaged is called a C. 172 Which of the following is (are) directly related to photon energy? A. 173 The CR should be directed to the center of the part of greatest interest to avoid A. 174 Which of the following matrix sizes is most likely to produce the best image resolution? D. 175 A shoulder was imaged using 300 mA, 7 ms, 70 kVp, 40-inch SID, 1.2-mm focal spot, and 100 speed screen/film combination. Which of the following changes, made to compensate for changes in optical density, would result in decreased production/visualization of blur? B. 176 If 84 kV and 8 mAs were used for a particular abdominal exposure with single-phase equipment, what milliampere-seconds value would be required to produce a similar radiograph with three-phase, 12-pulse equipment? D. 177 Of the following groups of exposure factors, which will produce the most radiographic density? C. 178 Which of the following conditions will require an increase in x-ray photon energy/penetration? D. 179 A compensating filter is used to B. 180 High-kilovoltage exposure factors are usually required for radiographic examinations using C. 181 If 400 mA, 10 ms, and 90 kV were used for a particular exposure using three-phase, 12-pulse equipment, which of the following exposure changes would be most appropriate for use on single-phase equipment to produce a similar image? D. 182 Underexposure of a radiograph can be caused by all the following except insufficient D. 183 Recorded detail can be improved by decreasing C. 184 If 85 kV and 20 mAs were used for a particular abdominal exposure with single-phase equipment, what mAs would be required to produce a similar radiograph with 3-phase, 12-pulse equipment. D. 185 If 82 kVp, 300 mA, and 0.05 second were used for a particular exposure using 3-phase, 12-pulse equipment, what mAs would be required, using single-phase equipment, to produce a similar radiograph? C. 186 Which of the following affect(s) both the quantity and the quality of the primary beam? C. 187 Methods that help to reduce the production of scattered radiation include using A. 188 If a duration of 0.05 second was selected for a particular exposure, what milliamperage would be necessary to produce 30 mAs? B. 189 Which of the following is (are) classified as rare earth phosphors? B. 190 In comparison with 60 kV, 80 kV will C. 191 A satisfactory radiograph was made without a grid using a 72-in. SID and 8 mAs. If the distance is changed to 40 in. and an 12:1 ratio grid is added, what should be the new milliampere-seconds value? B. 192 Which of the following examinations might require the use of 70 kV? A. 193 Recorded detail is directly related to A. 194 Several types of exposure timers may be found on x-ray equipment. Which of the following types of timers functions to accurately duplicate radiographic densities? D. 195 When involuntary motion must be considered, the exposure time may be cut in half if the kilovoltage is B. 196 Greater latitude is available to the radiographer in which of the following circumstances? B. 197 A positive contrast agent A. 198 Which of the following quantities of filtration is most likely to be used in mammography? A. 199 An exposure was made of a part using 300 mA and 0.06 second with a 200-speed film–screen combination. An additional radiograph is requested using a 400-speed system to reduce motion unsharpness. Using 400 mA, all other factors remaining constant, what should be the new exposure time? C. 200 Because of the anode heel effect, the intensity of the x-ray beam is greatest along the C. 201 Which of the following groups of exposure factors will produce the longest scale of contrast? B. 202 In which of the following examinations should 70 kV not be exceeded? C. 203 The squeegee assembly in an automatic processor C. 204 How is source-to-image distance (SID) related to exposure rate and radiographic density? D. 205 If 300 mA has been selected for a particular exposure, what exposure time should be selected to produce 18 mAs? B. 206 The direction of electron travel in the x-ray tube is B. cathode to anode 207 Exposure factors of 90 kV and 3 mAs are used for a particular nongrid exposure. What should be the new milliampere-seconds (mAs) value if a 12:1 grid is added? D. 15 208 The attenuation of x-ray photons is not influenced by B. 3 only 209 The functions of automatic beam limitation devices include A. 1 only 210 An anteroposterior (AP) radiograph of the femur was made using 300 mA, 0.03 second, 76 kV, 40-in. SID, 1.2-mm focal spot, and a 400-speed film–screen system. With all other factors remaining constant, which of the following exposure times would be required to maintain radiographic density at a 44-in. SID using 500 mA? B. 22 ms 211 If 85 kVp, 400 mA, and ? s were used for a particular exposure using single-phase equipment, which of the following milliamperage or time values would be required, all other factors being constant, to produce a similar density using three-phase, 12-pulse equipment? A. 200 mA 212 Factor(s) that can be used to regulate radiographic density is (are) D. 1, 2, and 3 213 Which of the following groups of exposure factors would be most appropriate for a sthenic adult IVU? A. 300 mA, 0.02 s, 72 kVp 214 The use of which of the following is (are) essential in magnification radiography? B. 2 only 215 Which of the following are methods of limiting the production of scattered radiation? C. 2 and 3 only 216 In a PA projection of the chest being used for cardiac evaluation, the heart measures 15.2 cm between its widest points. If the magnification factor is known to be 1.3, what is the actual diameter of the heart? B. 11.7 cm 217 Which of the following can affect histogram appearance? D. 1, 2, and 3 218 In digital imaging, as the size of the image matrix increases, C. 2 and 3 only 219 Which combination of exposure factors will most likely contribute to producing the longest-scale contrast? B. Group B 220 A satisfactory radiograph of the abdomen was made at a 38-in. SID using 400 mA, 60-ms exposure, and 80 kV. If the distance is changed to 42 in., what new exposure time would be required? C. 73 ms 221 A particular radiograph was produced using 12 mAs and 85 kV with a 16:1 ratio grid. The radiograph is to be repeated using an 8:1 ratio grid. What should be the new milliampere-seconds value? C. 8 222 When the collimated field must extend past the edge of the body, allowing primary radiation to strike the tabletop, as in a lateral lumbar spine radiograph, what may be done to prevent excessive radiographic density owing to undercutting? D. Use lead rubber to absorb tabletop primary radiation. 223 A lateral radiograph of the cervical spine was made at 40 in. using 300 mA and 0.03 second exposure. If it is desired to increase the distance to 72 in., what should be the new milliampere (mA) setting, all other factors remaining constant? C. 1000 mA 224 Which of the following focal-spot sizes should be employed for magnification radiography? A. 0.2 mm 225 An AP radiograph of the femur was made using 300 mA, 0.03 second, 76 kV, 40-in. SID, 1.2-mm focal spot, and a 400-speed film–screen system. With all other factors remaining constant, which of the following exposure times would be required to maintain radiographic density using 87 kV, a 200-speed film–screen system, and the addition of a 12:1 grid? A. 0.15 second 226 Which of the following is performed to check the correctness of the developing parameters? D. 227 An increase in kilovoltage with appropriate compensation of milliampere-seconds will result in A. 228 Which of the following groups of exposure factors would be most effective in eliminating prominent pulmonary vascular markings in the RAO position of the sternum? D. 229 Which of the following factors is/are related to grid efficiency? D. 230 Which one of the following is (are) used to control the production of scattered radiation? B. 231 Types of shape distortion include C. 232 If 300 mA has been selected for a particular exposure, what exposure time would be required to produce 6 mAs? D. 233 Central ray angulation may be required for C. 234 An automatic exposure control (AEC) device can operate on which of the following principles? C. 235 Exposure factors of 110 kVp and 12 mAs are used with an 8:1 grid for a particular exposure. What should be the new mAs if a 12:1 grid is substituted? C. 236 Which of the following statements is (are) true regarding Figure 7–10? C. 237 Radiographic contrast is a result of B. 238 Practice(s) that enable the radiographer to reduce the exposure time required for a particular image include D. 239 Decreasing field size from 14 x 17 into 8 x 10 inches will A. 240 Which of the following may be used to reduce the effect of scattered radiation on a finished radiograph? D. 241 Cassette-front material can be made of which of the following? B. 242 A technique chart should include which of the following information? D. 243 If 40 mAs and a 200-speed screen–film system were used for a particular exposure, what new milliampere-seconds value would be required to produce the same density if the screen–film system were changed to 800 speed? A. 244 The exposure factors of 400 mA, 17 ms, and 82 kV produce a milliampere-seconds value of B. 245 The advantage(s) of high-kilovoltage chest radiography is (are) that D. 246 A radiograph made using 300 mA, 0.1 second, and 75 kV exhibits motion unsharpness but otherwise satisfactory technical quality. The radiograph will be repeated using a shorter exposure time. Using 86 kV and 400 mA, what should be the new exposure time? B. 247 The term latitude describes B. 248 Of the following groups of exposure factors, which will produce the shortest scale of radiographic contrast? A. 249 What type of x-ray imaging uses an area beam and a photostimulable phosphor as the IR? B. 250 A technique chart should be prepared for each AEC x-ray unit and should contain which of the following information for each type of examination? D. 251 X-ray photon beam attenuation is influenced by D. 252 A satisfactory radiograph of the abdomen was made at a 42-inch SID using 300 mA, 0.06-second exposure, and 80 kVp. If the distance is changed to 38 inches, what new exposure time would be required? B. 253 Better resolution is obtained with A. 254 In radiography of a large abdomen, which of the following is (are) effective way(s) to minimize the amount of scattered radiation reaching the image receptor (IR)? A. 255 With all other factors constant, as digital image matrix size increases, C. 256 Compression of the breast during mammographic imaging improves the technical quality of the image because D. 257 An exposure was made using 8 mAs and 60 kV. If the kilovoltage was changed to 70 to obtain longer-scale contrast, what new milliampere-seconds value is required to maintain density? B. 258 Which of the following devices is used to overcome severe variation in patient anatomy or tissue density, providing more uniform radiographic density? A. 259 If 0.05 second was selected for a particular exposure, what mA would be necessary to produce 15 mAs? D. 260 Which of the following is likely to contribute to the radiographic contrast present on the finished radiograph? D. 261 The effect described as differential absorption is D. 262 A decrease from 200 to 100 mA will result in a decrease in which of the following? C. 263 The steeper the straight-line portion of a characteristic curve for a particular film, the B. 264 Which of the following terms/units is used to express the resolution of a diagnostic image? A. 265 A satisfactory radiograph was made without a grid, using a 72-inch SID and 8 mAs. If the distance is changed to 40 inches and an 8:1 ratio grid is added, what should be the new mAs? A. 266 Which of the following chemicals is used in the production of radiographic film emulsion? C. 267 An increase in the kilovoltage applied to the x-ray tube increases the B. 268 What is the single most important factor controlling size distortion? D. 269 Combinations of milliamperage and exposure time that produce a particular milliampere-seconds value will produce identical radiographic density. This statement is an expression of the C. 270 An increase in the kilovoltage applied to the x-ray tube increases the B. 271 The major function of filtration is to reduce D. 272 Which of the following methods can be used effectively to decrease differential absorption, providing a longer scale of contrast in the diagnostic range? B. 273 Which of the following could be used to improve recorded detail? B. 274 Which of the following is most likely to occur as a result of using a 30-in. SID with a 14 x 17 in. IR to radiograph a fairly homogeneous structure? B. 275 Which of the following combinations will result in the most scattered radiation reaching the image receptor? C. 276 Which of the following is most likely to produce a high-quality image? B. 277 Distortion can be caused by D. 278 Which of the following is most likely to result from the introduction of a grid to a particular radiographic examination? A. 279 Which of the following can affect radiographic contrast? D. 280 All other factors remaining the same, if a 14 x 17 in. field is collimated to a 4-in.-square field, the radiographic image will demonstrate B. 281 http://radrevieweasy.com/loadBinary.aspx?name=saia8&filename=saia8_c007f133b.jpg C. 282 Exposure factors of 100 kVp and 6 mAs are used with a 6:1 grid for a particular exposure. What should be the new milliampere-seconds value if a 12:1 grid is substituted? B. How does Sid affect radiographic density?As SID increases, intensity of the beam decreases. A 20% change in SID will cause a visible difference in density. We use the inverse square law to calculate the difference between distance and density. When SID is doubled, the density will decrease by a factor of 4 (will be 1/4 the original).
How is sid related to exposure rate and radiographic density quizlet?As SID increases, exposure rate increases and radiographic density increases. As SID increases, exposure rate increases and radiographic density decreases.
How is Sid related to exposure rate and receptor exposure?How is SID related to exposure rate and image receptor exposure? As SID increases, exposure rate decreases and receptor exposure decreases.
What effect does increasing Sid have on the exposure?The source image receptor distance (SID), is the distance of the tube from the image receptor, affecting magnification. The greater the SID, the less magnification the image will suffer.
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