FREE AND STUDY GAMES ABOUT RAD 147 EXAM

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FREE AND STUDY GAMES ABOUT RAD 147 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -42 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: FSS

Answer:

the physical area where xrays are created

Question 2: SIGNAL-to-NOISE RATIO

Answer:

Describes strength of exposure to amount of noise present in an image, Need adequate signal to create quality images,

High SNR: more signal than noise; better quality

Question 3: film imaging system dynamic range

Answer:

narrow, non linear

Question 4: barium fluorohalide

Answer:

The type of phosphor found in the PSP plate for computed radiography

Question 5: Benefits of compression devices include: lower patient dose, lower SNR, increased photoelectric absorption, reduced scatter production, increased scatter production

Answer:

lower pt dose & reduced scatter production

Question 6: what are the three forms of ionizing radiation?

Answer:

thin high band of UV light, x-rays, gamma Question 7: increasing collimation results in: (2)

Answer:

smaller field size & higher contrast

Question 8: AMA

Answer:

active matrix array

Question 9: use grid when patient body part is ___ thick

Answer:

>10 cm thick

Question 10: Variable-aperture

Answer:

The most commonly used beam restriction device Question 11: of those that occur at a higher kVp, a greater percentage are ____ interactions

Answer:

compton

Question 12: as filtration increases, RE ___

Answer:

decreases, filtration up-quantity down-re down

Question 13: digital imaging system dynamic range benefits

Answer:

better contrast, more shades of grey, sensitive to low levels of radiation & can take high exposure levels, can use a lower mAs

Question 14: grid ratio

Answer:

height of the lead strips/distance between the strips

Question 15: dynamic range/exposure latitude

Answer:

The range of exposure intensities/values an IR system can accurately detect

Question 16: off-center cutoff

Answer:

when the x-ray beam is not lined up with the center of the grid

Question 17: grid frequency

Answer:

the number of lead lines per in or cm

Question 18: aperture diaphragm

Answer:

the simplest type of beam restricting devices, a flat piece of lead with a hole in it

Question 19: cesium iodide.

Answer:

The scintillator for the indirect capture DR system that utilizes a CCD

Question 20: Grids absorb scatter radiation because the scattered photons

Answer:

travel at an angle to the transmitted photons.

Question 21: linear grid

Answer:

has lead strips that travel in one direction.Question 22: the purpose of automatic collimation is to:

Answer:

limit pt exposure

Question 23: histogram

Answer:

a graphical representation of the amount of radiation that stuck the IR Question 24: PSP plates are read using:

Answer:

helium neon laser Question 25: Which of the following produces the greatest amount of scatter radiation exiting the patient?Low kVp and small field size.Low kVp and large field size.High kVp and small field size.High kVp and large field size.

Answer:

high kVp & lg field size

Question 26: focused grid

Answer:

lead strips are angled to match the angle of divergence in the primary beam.