RT 265 Test Q25

What is the principal difference between screen film & CR?
A. Analog vs digital
B. Involves light
C. Requires processing
D. Uses imaging plate

The laste light used in CR?
a. is in the Ultraviolet region
b. Is more energentic than stimulated light
c. Is pulsed acrossed the photstimulable phoshor
d. Has longer Wavelength tha stimulated light
e. Produces light of Intense Fluorescence

Which step can be eliminated for CR (vs used in film screen)
a. Hang images
b. Perform examinations
c. Process image
d. Reload the cassette
e. Repeat the examination

What is an Electron that is described as being Metastable?
a. Is outside of the Atom
b. Is present in positive & negative form
c. Is the transformation of an x-ray
d. Has been captured by the nucleus
e. Has Higher energy than it should have

Doping of a photostimulable sphosphor w/ Europium =
a. Better contrast
b. Better spatial resolution
c. igher x-ray absorption
d. Lower patinet dose
e. More stimulable light emission

What Activator in a Photostimulable phosphor is there to do what?
a. Define Laser wavelength
b. Enhance electron Metastability
c. Increase x-ray absorption
d. Select the proper Wavelength
e. Shape the wavelength of stimulable emission

Which of the Following is Most Intense?
a. Laser light
b. Normal Visual Light
c. Optical lens support
d. STimulable emission
e. x-ray beam

Which of the following is monochromatic?
a. Infrared light
b. Laser light
c. Stimulated emission
d. visible light
e. x-ray beam

Photostimulable phosphor image receptor are effective because:
a. Metastable states are produced
b. Optical Density is Proportional to Dose
c. Spatial Resolution is Improved
d. Their response follows the H & D curve.
e. They are composed of detector elements (DELs)

The electron binding energy of a photostimulable phosphor is closets to
a. 10keV
b. 20 keV
c. 35 keV
d. 50 keV
e. 75 keV

As a descriptor of a photostimulable phosphor, The term Turbid refers to an apperance of
a. black
b. Clear
c. Color
d. Cloudy
e. Gray

Europium is an Activator in the photostimulable phosphor. An Activator is Responsible for ?
a. Contrast Resolution
b. Emitted light intensity
c. Reduced patient Dose
d. Spatial Resolutin
e. x-ray absorption

Photostimulable phosphor image receptors:
a. Are relatively insenitive to x-rays
b. Become radiation fatigued with age
c. Can be fogged by background radiation
d. Have better spatial resolution than screening-film
e. Require Higher Patient Dose

To remove the iamge of background radiation or a previous image, you should:
a. Clear the image receptor with a cleaning solution
b. Expose the image receptor to intense light.
c. Expose the image recptor to intense x-ray exposure
d. Store the image receptor for 3days
e. Transfer the image receptor signal to digital storage

Which of the following is the proper sequence for producing a CR image?
a. Erase/read/expose
b. Expose/erase/read
c. Expose/read/erase
d.Read/erase/expose
e. Read/expose/erase

25-2
Q1. The photostimulable emission in CR:
a.Has Longer Wavelength than Laser stimulating light
b. Has Shorter Wavaelength than Laser stimulating light
c. Is discrete, as is the Laser-stimulating light
d. Is in the far infrared region of the Specturm
e. Is monochromatic, as is the laser-stimulating light

25-2 (Q2) The slow-scan portion of the CR reader:
a. Has a speed that is determined by the emission rate
b. Is under mechanical control
c. Is under Optic Control
d. Relies on a Photometric Respone
e. Requires mirrors & prisms

25-2 (Q3) Spatial Resolution is CR is Principally determined by:
a. Fast-scan rate
b. Field of View (FoV)
c. Laser beam diameter
d. Phosphor size
e. Slow-scan rate

25-2 (Q4) The source of the stimulating light is:
a. Emitted light
b. The laser
c. The Optic path
d. The photmeter
e. X-radiation

25-2 (Q5) What is the approximate diameter of the laser beam?
a. < 1 um
b. 10um
c. 100um
d. 1000um
e. >1000um

25-2 (Q6) How does the CR reader maintain the laser beam as a circle
a. Beam-shaping optics
b. Fast-scan regulation
c. Intensity control
d. Light-collecting optics
e. Slow-scan regulation

25-2(Q7) Which of the followig is NOT a Photodector
a. ADC
b. CCD
c. CMOS
d. PD
e. PMT

25-2 (Q8) The x-ray capture element of a CR image plate is?
a. BaFlBr
b. Cassette
c. CCD
d. Laser beam
e. Light-collecting optics

25-2 (Q9) The characteristic Curve of a CR imaging plate is described as
a. Detective quantum effciency
b. Image Buffer
c. Image Receptor response function
d. Modulation transfer function
e. Sampling quantization

25-2 (Q10) A screen film image receptor is responsive over how many oders of mangitude
a. One
b. Two
c. Three
d. Four
e. Five

25-2 (Q11) An advantage of CR over Film screen is relatively constant:
a. Image contrast
b. Image processing
c. Optical Density
d. Patient positioning
e. Radiographic techniques

25-2 (Q12) Patient radiation dose reduction in CR is limited by?
a. Fast-scan mode
b. Image contrast
c. Patient size
d. Slow-scan mode
e. System noise

25-2(Q13) Which of following applies to CR when it is compared to Film screen.
a. kVp is less important
b. Image processing is faster
c. mAs is less important
d. Optical density is better
e. Patient positioning is easier

25-2 (Q14) Which of the following is an advantage of CR over screen film?
a. EAsier viewing
b. Fewer repeats
c. Patient positioning
d. Patient scheduling
e. Technique selection

25-2(Q15) A CR image receptor is responsive to an x-ray beam over how many orders of magnitude?
a. One
b. Two
c. Three
d. Four
e. Five