# Shared Flashcard Set

## Details

Resolution, Distortion, Artifacts, and Technique Test
55
Health Care
05/08/2014

Term
 The relationship between screen speed and resolution is:Select one:a. inverse b. direct
Definition
 a. inverse
Term
 The primary controlling factor of density isSelect one:a. focal spotb. mAs c. kVpd. SIDe. filtration
Definition
 b. mAs
Term
 Any irregularity on an image that is not caused by the proper shadowing of tissue by the primary beamSelect one:a. artifactb. elongationc. foreshorteningd. distortion
Definition
 d. distortion
Term
 Which of the following sets of factors will produce the x-ray image with the shortest scale of contrast? mA time kVp grida. 200 .02 85 6:1b. 300 .10 65 16:1c. 400 .05 70 8:1d. 200 .15 75 12:1Select one:a. ab. cc. dd. b
Definition
 d. b
Term
 In order to notice a visible change in a film’s density, by how much must the mAs be increased or decreased?Select one:a. 30% b. 15%c. 20%d. you must always half or double your mAs
Definition
 a. 30%
Term
 Patient motion will result in a decrease of what on a radiograph? 1. resolution 2. contrast 3. densitySelect one:a. 1 onlyb. 2 onlyc. 1 and 2d. 2 and 3e. 1, 2, and 3
Definition
 a. 1 only
Term
 Which of the following will result in the least amount of patient exposure?Select one:a. increase kVp, increase mAsb. decrease kVp, increase mAsc. decrease kVp, decrease mAs d. increase kVp, decrease mAs
Definition
 d. increase kVp, decrease mAs
Term
 A radiograph is produced with too little contrast and excessive radiographic density. Which of the following changes will best correct this error?Select one:a. increase the mAs, increase the kVpb. decrease the mAs, increase the kVp c. increase the mAs, decrease the kVpd. decrease the mAs, decrease the kVp
Definition
 d. decrease the mAs, decrease the kVp
Term
 Using the small filament in the x-ray tube versus using the large filament will result in a: 1. increase in contrast 2. decrease in distortion 3. decrease in density 4. increase in resolution Select one:a. 3 onlyb. 4 only c. 1 and 2d. 2 and 3e. 1 and 4
Definition
 b. 4 only
Term
 Which of the following sets of technical factors will produce a radiograph with the greatest amount of recorded detail? mAs kVp grid screen focal ssa. 20 85 8:1 100 1 mmb. 40 70 12:1 400 2 mmc. 35 62 6:1 400 1 mmd. 60 80 10:1 100 2 mmSelect one:a. cb. a c. bd. d
Definition
 b. a
Term
 The overall blackening on a film best describesSelect one:a. resolutionb. contrastc. distortiond. density
Definition
 d. density
Term
 The amount of magnification on a film is determined by:Select one:a. SOD/SIDb. OID/SOD c. SID/SODd. SOD/OID
Definition
 c. SID/SOD
Term
 When the central ray is perpendicular to the image receptor, but the part is neither perpendicular to the central ray nor parallel to the image receptor, _____ occurs:Select one:a. elongation b. foreshortening
Definition
 a. elongation
Term
 Which of the following factors will increase radiographic contrast? 1. using a slower screen speed 2. decreasing collimation 3. using a higher grid ratioSelect one:a. 1 onlyb. 3 onlyc. 1 and 2 d. 2 and 3e. 1, 2, and 3
Definition
 b. 3 only
Term
 Which of the following sets of technical factors will produce a radiograph with the greatest amount of magnification? mAs kVp SID OID FSSa. 15 60 140 cm 20 cm 2 mmb. 30 80 180 cm 20 cm 1 mmc. 25 70 180 cm 30 cm .3 mmd. 50 65 100 cm 30 cm .3 mmSelect one:a. bb. cc. ad. d
Definition
 d. d
Term
 A change in which geometric factor will not effect the magnification of a radiographic image?Select one:a. SODb. OIDc. focal spot d. SID
Definition
 c. focal spot
Term
 Recorded detail can be improved by:Select one:a. collimationb. decreasing the SIDc. decreasing the kVpd. decreasing the phosphor crystal size
Definition
 d. decreasing the phosphor crystal size
Term
 The utilization of 120 kVp will result in:Select one:a. high exposure latitude and short scale contrastb. low exposure latitude and short scale contrastc. high exposure latitude and long scale contrastd. low exposure latitude and long scale contrast
Definition
 c. high exposure latitude and long scale contrast
Term
 Which of the following has no impact on contrast? 1. kVp 2. focal spot size 3. filtration 4. collimationSelect one:a. 1 onlyb. 2 only c. 2 and 3d. 1, 3, and 4e. 1, 2, 3, and 4
Definition
 b. 2 only
Term
 This type of artifact results in emulsion pickoff, gelatin buildup- sludge and can appear as sharp positive or negative optical density on filmSelect one:a. roller mark b. dirty rollersc. chemical fogd. wet pressure sensitization
Definition
 b. dirty rollers
Term
 Which of the following factors will affect the visibility of detail? 1. OID 2. SID 3. mAs 4. focal spot sizeSelect one:a. 1, 2, and 4 b. 3 onlyc. 3 and 4d. 2 and 4e. 1 and 2
Definition
 b. 3 only
Term
 An increase in radiographic density can result from an increase in: 1. SID 2. kVp 3. mAsSelect one:a. 1 and 2b. 1 and 3c. 2 and 3 d. 1, 2, and 3
Definition
 c. 2 and 3
Term
 The penetrability of an x-ray beam is determined bySelect one:a. kVp b. mAsc. grid ratiod. screen speed
Definition
 a. kVp
Term
 How much a technologist can change or vary an exposure technique without compromising image quality is referred to as:Select one:a. latitude b. contrastc. quantum mottled. resolution
Definition
 a. latitude
Term
 Recorded detail can be improved by doing the following: 1. increasing the OID 2. increasing the SID 3. decreasing the OID 4. decreasing the focal spot sizeSelect one:a. 1 and 2b. 2 and 3c. 1, 3, and 4d. 2, 3, and 4
Definition
 d. 2, 3, and 4
Term
 What effect does changing the kVp from 70 to 55 have on an image?Select one:a. decreases contrastb. increases contrast c. produces a low contrast imaged. produces a long scale of contrast
Definition
 b. increases contrast
Term
 A reduction in scatter radiation is likely to occur from which of the following: 1. increased kVp 2. decreased collimation 3. increase in grid ratio 4. decrease in tissue volumeSelect one:a. 3 onlyb. 1 and 3c. 2 and 3d. 3 and 4 e. 1, 2, and 4
Definition
 d. 3 and 4
Term
 Which of the following kVp values will produce an x-ray with the shortest scale of contrast?Select one:a. 90b. 75c. 62d. 50
Definition
 d. 50
Term
 Adding filtration to an x-ray beam willSelect one:a. increase the average energy of the beamb. increase the recorded detailc. increase the contrast d. increase the density
Definition
 a. increase the average energy of the beam
Term
 The primary controlling factor of contrast isSelect one:a. kVp b. distancec. mAsd. filtration
Definition
 a. kVp
Term
 Artifacts from radiation and light fog can be caused by —heat below 68 degrees and 40 to 60 % humidity.Select one:TrueFalse
Definition
 True
Term
 Which of the following sets of technical factors will result in a film with the least amount of chance for motion?Select one:a. 500 mA, .04 sec, 80 kVpb. 400 mA, .05 sec, 60 kVpc. none of the above, they all have the same mAs d. 100 mA, .2 sec, 65 kVpe. 200 mA, .1 sec, 75 kVp
Definition
 a. 500 mA, .04 sec, 80 kVp
Term
 Low kVp produces which of the following? 1. high contrast 2. few gray tones 3. long scale contrast 4. short scale contrast 5. low contrast 6. many gray tonesSelect one:a. 1 onlyb. 5 onlyc. 3 and 5d. 1, 2, and 4 e. 3, 5, and 6
Definition
 d. 1, 2, and 4
Term
 The purpose of mAs is toSelect one:a. regulate density b. provide higher contrastc. increase recorded detaild. increase x-ray beam penetration
Definition
 a. regulate density
Term
 Radiographic contrast can best be described as:Select one:a. the overall blackening on a radiographb. the difference between densities c. how black and white an image appearsd. the amount of grayness on a radiograph
Definition
 b. the difference between densities
Term
 Magnification is another name for:Select one:a. resolutionb. penumbrac. shape distortiond. size distortion
Definition
 d. size distortion
Term
 Electron build up on the emulsion due to low humidity is referred to as staticSelect one:True CorrectFalse
Definition
 True
Term
 A film is said to possess excessive radiographic density. This would appear:Select one:a. to have poor recorded detailb. to have excessive contrastc. darker than normal d. lighter than normal
Definition
 c. darker than normal
Term
 A technique chart calls for 10 mAs at 72 kVp for a particular x-ray. An unacceptable image is produced using 10 mAs at 62 kVp; the image is too light. How can this problem best be corrected?Select one:a. increase the mAsb. decrease the kVpc. decrease the mAsd. increase the kVp e. decrease the SID
Definition
 d. increase the kVp
Term
 Given a baseline technique of 200 mA, .1 sec, 70 kVp, 40” SID, 12:1 grid, 400 screen, indicate what effect the following changes will have on contrast: - mark “A” for increase - mark “B” for decrease - mark “C” for no change80 kVp 100 screen 300 mA .2 sec 16:1 grid
Definition
 80 kVp– b,100 screen– c,300 mA .2 sec– c,16:1 grid– a
Term
 The white areas on a radiograph are the result of what type of attenuation?Select one:a. scatterb. absorption
Definition
 b. absorption
Term
 Beam restriction has the following effect on contrastSelect one:a. decreases the contrast by decreasing the field sizeb. increases the contrast by reducing the volume of tissue irradiated c. increases the contrast by increasing the field sized. decreases the contrast by reducing the volume of tissue irradiated
Definition
 b. increases the contrast by reducing the volume of tissue irradiated
Term
 Improper tube, object and image receptor alignment will result in:Select one:a. shape distortion b. motion distortionc. size distortiond. lack of recorded detail
Definition
 a. shape distortion
Term
 An AP abdomen is taken using 75 kVp, 40 mAs, 40” SID, 400 screen, 12:1 grid, 1.2 mm focal spot. The kidneys lie 4” from the back of the patient’s body. In addition, the patient’s back is 3” from the bucky. What is the penumbra (focal spot blur) of the kidneys?Select one:a. .1 mmb. .129mm Incorrectc. .097 mmd. .25 mm
Definition
 d. .25 mm
Term
 The first method technologists should use to control voluntary motion:Select one:a. restraining devicesb. sandbagsc. adequate communication
Definition
Term
 An AP abdomen is taken using 75 kVp, 40 mAs, 40” SID, 400 screen, 12:1 grid, 1.2 mm focal spot. The kidneys lie 4” from the back of the patient’s body. In addition, the patient’s back is 3” from the bucky. What is the magnification factor of the kidneys?Select one:a. 1.08b. .825 c. 1.21d. 1.11
Definition
 c. 1.21
Term
 Given a baseline technique of 300 mA, .5 sec, 65 kVp, 48” SID, 10:1 grid, 200 screen, indicate what effect the following changes will have on density: - mark “A” for increase - mark “B” for decrease - mark “C” for no change72" SID 100 screen 90 kVp 200 mA, .8 secs
Definition
 72" SID– b,100 screen– b,90 kVp– a,200 mA, .8 secs– a
Term
 An AP abdomen is taken using 75 kVp, 40 mAs, 40” SID, 400 screen, 12:1 grid, 1.2 mm focal spot. The kidneys lie 4” from the back of the patient’s body. In addition, the patient’s back is 3” from the bucky. determine the size of the kidneys on the radiograph. The actual size of the kidneys is 4.1” X 6.2”.Select one:a. 4.4" x 6.7"b. 3.4" x 5.1" Incorrectc. 4.6" x 6.9"d. 5.0" x 7.5"
Definition
 d. 5.0" x 7.5"
Term
 A lack of photons striking an image receptor that results from very fast screens used with low mAs settings causes:Select one:a. line pairs per millimeterb. focal spot blurc. quantum mottle d. distortion
Definition
 c. quantum mottle
Term
 As the SID is increased, the density on the filmSelect one:a. decreases b. remains the samec. increases
Definition
 a. decreases
Term
 Handling artifacts can only occur prior to processing the film.Select one:TrueFalse
Definition
 False
Term
 Given a baseline technique of 400 mA, .02 sec, 62 kVp, 48” SID, x-ray performed tabletop, tube angled 30 degrees caudal, indicate what effect the following changes will have on distortion (size and shape): - mark “A” for increase - mark “B” for decrease - mark “C” for no change50 kVptube perpendicular to the image receptor x-ray performed in the bucky 20 mAs
Definition
 50 kVp– c,tube perpendicular to the image receptor– b,x-ray performed in the bucky– a,20 mAs– c
Term
 Given a baseline technique of 300 mA, .1 sec, 75 kVp, 60” SID, 3” OID, 12:1 bucky grid, 400 screen, indicate what effect the following changes will have on recorded detail: - mark “A” for increase - mark “B” for decrease - mark “C” for no changex-ray performed tabletop 40" SID 70 kVp100 screen
Definition
 x-ray performed tabletop– a,40" SID– b,70 kVp– c,100 screen– a
Term
 Calculate the penumbra (focal spot blur) using a .5 mm focal spot, 40” SID, 5” OIDSelect one:a. .07mmb. 3.5 mmc. .06 mm d. 4 mm
Definition
 a. .07mm
Term
 An image that is predominately black and white is said to exhibit this type of contrast: 1. short scale 2. low 3. long scale 4. highSelect one:a. 1 onlyb. 2 and 4c. 2 and 3d. 1 and 4 e. 1 and 2
Definition
 d. 1 and 4
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