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RADT 465 Img AC & EV
ARRT Registry Review Covering Image Acquisition and Evaluation
Question | Answer |
---|---|
What will occur if there is an increase in added filtration? | A decrease in x-ray intensity and an increase in effective energy of x-ray beam (Bushong, pp.146-147) |
X-ray tubes in CT scanners must be able to do what? | Rotate at high speed, produce short pulsed exposures, and ability to withstand millions of heat units (Bushong, pp. 429-430) |
What component of the CR imaging plate records the image? | Photostimulable phosphor (Carlton and Adler, pp. 357-358) |
What transforms the luminescent light given off by the PSP into an image? | Analog-to-digital converter (ADC) (Carlton and Adler, pp. 357-358) |
In order to minimize motion unsharpness, what steps need to be taken? | Give patient instructions, suspend respiration, use short exposure times (Carlton and Adler, p. 451) |
What will happen if one uses a short SID with a large image receptor? | Increase in anode heel effect (Carlton and Adler, p. 407) |
In what way do electrons travel in the x-ray tube? | Cathode to anode (Bushong, p. 122-125) |
If the patient being x-rayed was diagnosed with atelectasis, what would one do to exposure factors? | Increase (Bushong, p. 253) |
If the patient being x-raying suffered from emphysema, what would one do to exposure factors? | Decrease (Bushong, p. 253) |
What is the term used to describe the reduction of x-ray photon intensity as it passes through materials? | Attenuation (Bushong, p. 185) |
What type of frequency and wavelength are diagnostic x-rays associated with? | High frequency and short wavelength (Fosbinder and Orth, p. 18) |
What does scatter radiation cause on a radiographic image? | Produces fog (Bushong, p. 248) |
What can be done to help reduce scattered radiation? | Compression and beam restriction (Carlton and Adler, p. 228) |
What occurs as the intensity of ionizing radiation decreases? | The distance from the source of radiation increases (Fosbinder and Orth, p. 20) |
Annotation and inversion/reversal are known as what? | Digital image postprocessing tasks (Bushong, p. 473) |
What is the purpose of the electroconductive layer of a PSP plate? | To facilitate transportation through the scanner/reader (Fosbinder and Orth, p. 213) |
What is used to measure the thickness of anatomical parts to determine exposure factors? | Caliper (Bushong, p. 308) |
What device analyzes focal-spot accuracy and requires two exposures? | Slit camera (Bushong, p. 462) |
The anode heel effect causes the intensity of the x-ray beam to be greatest where? | Cathode end of beam (Carlton and Adler, p. 407) |
What optimal kVp would be used for a skull? | 80 kVp |
In CT, beam attenuation or density values are expressed as what? | Hounsfield units and CT numbers (Fosbinder and Orth, pp. 262-263) |
What does a QA program do? | Helps to keep patient dose to a minimum, keeps radiographic quality consistent, and ensure equipment efficiency (Carlton and Adler, pp 480-481) |
What category do double exposures, motion, and image fading fall into? | Artifacts (Bushong, p. 473) |
What does not affect attenuation of a x-ray photon? | Photon quantity (Bushong, p. 185) |
What type of radiation interaction is responsible for producing the most x-ray photons at the x-ray tube target? | Bremsstrahlung (Fosbinder and Orth, p. 74) |
What happens to the scale of contrast as grid ratio decreases? | Becomes longer (Carlton and Adler, p. 432) |
What is the term used to describe the continued emission of light by a phosphor after the activating source has ceased? | Phosphorescence (Bushong, p. 221) |
What would occur if anatomy was off-centered causing grid cutoff? | Overall loss of density (Carlton and Adler, p. 257) |
Geometric unsharpness is directly influenced by what? | OID (Carlton and Adler, pp. 444-445) |
Recorded detail can be improved by decreasing what? | OID and patient/part (Carlton and Adler, p. 451) |