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RADT 456-Image Eval
ARRT registry review covering image production and evaluation
| Question | Answer |
|---|---|
| True or False. Pixel size is determined by dividing the FOV by the matrix. | True |
| What pixel size has a 512 x 512 matrix with a 10 cm FOV? | .19 mm/pixel |
| True or False. The FOV and matrix size are dependent upon each other? | False. They have a independent relationship. A change can occur between one without affecting the other |
| What are two common materials used to construct grid interspaces? | Aluminum and plastic fiber |
| True or False. SID is directly related to recorded detail. | True |
| Going from a 14 x 17 in field size to a 8 x 10 excluding any other changes, will | Decrease the amount of scattered radiation generated within the part |
| What exposure factor group will produce the most radiographic density: 600 mA, 30 ms 400 mA, 70 ms | 400 mA, 70 ms |
| What is the function of the photostimulable phosphor? | Records the actual radiologic image. It is a component of the IP. |
| DEXA is also known as? | Dual x-ray absorptiometry |
| The luminescent light emitted by the PSP is transformed into the image seen on the CRT by what? | ADC. Analog to digital converter |
| What does the term windowing describe? | Changing the image brightness and/or contrast scale |
| What can cause foreshortening to occur? | The radiographic object being placed at an angle to the IR |
| Each cm increase in patient thickness requires what adjustment to kVp? | Increase of 2 kVp |
| How should unopened boxes of radiographic film be stored? | Away from radiation in a vertical position |
| What can occur if film is improperly stored and stacked upon each other? | Pressure marks |
| True or False. Film emulsion is much more sensitive to safelight fog after exposure | True |
| What is the relationship between photon energy and wavelength? | Inversely related. As energy increases the wavelength decreases |
| When comparing a 8:1 grid to a 16:1 grid ratio, the 16:1 will | Absorb more primary radiation and scattered radiation |
| What is the definition of grid ratio? | The height of the lead strips to the width of the interspace material |
| What occurs when image details are placed away from the path of the CR that become exposed by more divergent rays? | Rotation distortion |
| What are the two types of shape distortion? | Elongation and foreshortening |
| When does resolution in CR increase? | As the laser beam size decreases and the PSP crystal size decreases |
| Which pathological condition would require an increase in exposure technique: Emphysema or Atelectsis | Atelectasis |
| Which pathological condition would require a decrease in exposure technique: pneumoperitoneum or pneumonia? | Pneumoperitoneum |
| True or False. Field size affects exposure rate of the primary beam. | False. The exposure rate is affected by distance, kilovoltage and milliamperage. |
| When using a focused reciprocating grid, what causes grid cutoff? | Inadequate SID |
| What can occur if the developer temperature is too high? | Chemical fog can occur as a result of less/unexposed silver halide crystals being reduced |
| Greater latitude is available with the use of? | Low grid ratios or using high kv technical factors |
| The term FOV describes what? | How much of the patient is included in the matrix |
| For the same FOV, when will spatial resolution be improved? When using a large or small matrix? | Large matrix |
| Focal spot size, OID and SID are related to? | Recorded detail |
| What is the relationship between mAs and patient dose? | Directly proportional. As mAs increases-patient dose increases. |
Created by:
kjschapker
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