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RADT 456: Image Aqu
ARRT registry review
| Question | Answer |
|---|---|
| What can be measured with a pinhole camera, slit camera, or star-pattern-type resolution device? (232) | Focal-spot size |
| What is the term that refers to the abnormal distention of the pulmonary alveoli or tissue spaces with air? (246) | Emphysema |
| The larger the matrix size, the better the __________? (253) | Image resolution |
| What system moves film from solution to solution between rollers, changing the direction of the film around critical turns? (267) | Transport System |
| True or False. The shortest possible exposure time should be used to minimize motion unsharpness? (236) | True |
| What is the term that is used to define a grainy, spotted, or freckled appearance? (249) | Quantum noise or mottle |
| What are used in radiography to trap scattered radiation that would otherwise cause fog on the radiograph? (258) | Grids |
| What is the sum of film emulsion contrast and subject contrast? (262) | Radiographic contrast |
| What type of distortion is caused by misalignment of the x-ray tube, the part to be radiographed, and the IR film? (270) | Shape distortion |
| As grid ratio increases, more penetration and greater production of scattered radiation occur, producing what kind of contrast scale? (255) | Longer scale |
| What is defined as the heigh of the lead strips to the width of the interspace material? (237) | Grid ratio |
| What is the result if the developer replenishment is excessive and too much new solution is replacing the deteriorated developer? (241) | Chemical fog |
| Beam alignment must be accurate to within ___% of the SID. (245) | 2% |
| A 15% increase in kilovoltage means that the mAs must be what? (251) | Divided by 2 |
| How is SID related to recorded detail and resolution? (256) | Directly |
| Name the law that the intensity or exposure rate of radiation is inversely proportional to the square of the distance from its source? (264) | Inverse-square law |
| Pneumoperitoneum is an abnormal accumulation of air in the peritoneal cavity and would require a what in exposure factors? (264) | Decrease |
| What is the percentage range of humidity that x-ray film should be stored in? (268) | 40-60% |
| What is the factor for a 8:1 grid ratio? (274) | 4 |
| Reproducibility testing should specify that radiation output be consistent to within how much percentage? (271) | +/- 5% |
| One way to alter image contrast and/ or brightness is through? (235) | Windowing |
| A 15% decrease in kilovoltage means that the mAs must be what? (245) | Multiplied by 2 |
| What is the definition for a graphic representation of pixel value distribution? (247) | Histogram |
| True or False. With three-phase equipment, the voltage never drops to zero. (246) | True |
| What function to limit the size of the irradiated field? (256) | Beam restrictors |
| The general rule is that structures measuring more than ____cm should be radiographed with a ged. (262) | 10 |
| What kind of testing provides beam quality information that is different from that obtained from kV testing? (251) | HVL |
| What are the four parts of x-ray film processing? (249) | Development, fixing, wash, and dry |
| Central ray angulation against the direction of the lead strips will result in? (240) | Grid cutoff |
| The single most important factor regulating radiographic contrast is? (256) | Kilovoltage |
Created by:
hmchew2
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