FREE RADIOLOGY AND STUDY GAMES ABOUT COMPUTED

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FREE RADIOLOGY AND STUDY GAMES ABOUT COMPUTED

RADIOLOGY EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -60 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: image display

Answer:

konica, FUGI, and phillips range 100-200 (HHMC,TLI,POI) above underexposed, high quantum mottle noise due to low MAs/ below overexposed

Question 2: CR is used where?

Answer:

HHPO,POI, TLI, HMC fugi portables, and DR/DF rooms will allow for use of CR imaging plates.

Question 3: europium/activator

Answer:

impurity to allow luminescence has excess e- at ground level

Question 4: Agfa

Answer:

log base

Question 5: PSP construction needle/columnar phosphor

Answer:

phosphor crystals arranged as needles or columns

Question 6: the back side of a cassette is made out of what?

Answer:

radio-opaque lead foil which prevents back scatter which would fog the IP (imaging plate)

Question 7: lgM

Answer:

logarithm of a histogram median. directly related to expo. a PSP plate receives an is log based

Question 8: stitching

Answer:

used in scoliosis treatment

Question 9: EI

Answer:

exposure index- logarithm based exposure index directly related to the exposure level a PSP plate receives

Question 10: PSP

Answer:

barium fluorohalide doped with europium x halide (gives off light) can be bromide,chlorine or iodine, etc

Question 11: ROI

Answer:

region of interest - area that you collimate to level of interest

Question 12: CR or computed radiography uses what?

Answer:

imaging plate

Question 13: 2nd scan

Answer:

fast progressive scanning/ 2nd phase of light. main read for fast scan increased intensity. scanned by narrowly collimated laser for maximum detail. laser causes phosphors to emit stored latent image in the form of light photons

Question 14: the tube side of the cassette is made out of what?

Answer:

radiolucent (black side) carbon fiber or backer light material

Question 15: acquisition of latent image

Answer:

(invis image on IP) x radiation ionizes europium sites causing them to release free e- free e-s are moved to a higher energy band called f center. f center holds e- in bound state. # of trapped e-s is equal to absorbed radiation

Question 16: the bar code allows for the detection of what?

Answer:

the correct patient and histogram (projection)

Question 17: LSR

Answer:

limiting spatial resolution- an indicator of the detectors ability to resolve small structures

Question 18: processing the latent image

Answer:

load the cassette into the IRD. IP scanned twice by helium neon laser beam

Question 19: the imaging plate is the acquisition or capture of what ?

Answer:

the latent image

Question 20: conversion of latent into manifest image

Answer:

laser causes trapped e- at f center to be released called photostimulated excitement.e- go back to europium site and give off bluish purple light called photostimulated luminance. light is collected and sent to the PMT. PMT converts light into elect. si

Question 21: where is the imaging plate?

Answer:

mounted inside the cassette onto the backside of the cassette

Question 22: image appearance

Answer:

determined by receptor exposure. average value is 200

Question 23: is the IP reusable?

Answer:

yes

Question 24: IP construction/ #4 phosphor (active)

Answer:

photostimulable phosphor (PSP- gives off light twice ), which collects or acquires the latent image

Question 25: practical tips continued

Answer:

do not turn tube w/ grid or you will get grid lines. blue line down if LW/ to your right if CW

Question 26: practical tips for CR imaging plate

Answer:

erase plate if unsure of what is on it or it has not been used in 48 hours. erase plate a 2nd time if double used or large patient/part which prevents ghosting. process within 1 hr of exp to avoid image denigration (fading)latent image loses 25% in 8 hrs

Question 27: IR

Answer:

image reader device

Question 28: LUT

Answer:

look up table is where the gray scale rendered or default visible manifest image appears after processing. where widow width or range can be adjusted. changing the window level changes brightness or density. image data from histogram is rescaled also