ARRT PRACTICE EXAM - 1. Effective dose may be found in what publishe...

ARRT PRACTICE EXAM

COMPLETE ANSWERS 100% CORRECT (LATEST 2024 / 2025 )

1. Effective dose may be found in what published material?: NCRP reports

• The smallest particle of an element that retains the characteristics of the element is an?:

atom

3. Atomic mass =: number of protons = number of neutrons

4. Electronic timers used in xray equipment allow for exposure times of?: -

1/1000 seconds

• To ensure consistency of radiographic quality from one exposure to the next, what device

may be used?: AEC

• Devices in the x-ray circuit that operate on the principle of mutual induction are called?:

Transformers

• The high voltage section of the x-ray circuit makes use of what type of transformer?: Step-

up

• Xray tube NEEDS what type of current?: DC direct current rectifier changes AC to DC

9. The result of thermionic emission is?: Electron cloud

10. Focusing cup is located at the?: Cathode

• Outer shell filling holes in the K-shell is?: Characteristic K-shell holds 2 elections

12. Digital fluro should be viewed on?: High resolution monitor

• A primary advantage of digital fluro is?: Post processing and manipulation of the image
• Algorithm is?: A mathematical formula used to reconstruct the image in digital imaging.
• In CR each pixel corresponds to a shade of gray representing an area in the patient known

as a?: voxel

• Lightness and darkness maybe be adjusted by?: Adjusting WINDOW LEVEL (brightness)

Window width (contrast or gray level)

17. The window level in CR is the?: Midpoint of densities

18. The amount of receptor exposure is controlled PRIMARILY by?: mAs

19. The visible image may also be called the?: Manifest image

• The rule or law that governs changing technique using kVp is the?: 15% rule 1 / 2

• If SID is halved, what may be said about receptor exposure?: exposure is quadrupled

22. CR cassettes should be erased at least?: Every 48 hours

23. The equation H/D (height/distance) refers to what?: grid ratio

24. If the exposure field is not accurately recognized the histogram?: Widens

• Edge enhancement provides?: Artificial increase in display CONTRAST at an edge of the

image.

• Grid frequency is described as?: The number of lead strips per inch or centimeters
• When working with CR and DR one must be aware that their response to scatter radiation

is?: Very sensative

28. A histogram analysis error may be caused by?: Inappropriate collimation

29. Smoothing provides?: Evenness in brightness

• Consistency of image appearance is achieved through the use of?: Uniform processing codes

31. Poor spatial resolution =: Short SID Better with Long SID

• Beam restriction has the following effect on contrast?: Shorter scale of contrast

33. As kVp increases, there is an increased production of?: Short wavelengths

• The relationship between kVp and receptor exposure is:: Direct but no proportional
• Grids that have strips angled to coincide with divergence of the x-ray beam are called?:

Focused grids

• In digital imaging the radiographer must be aware that:: The image is determined by the

total exposure.

37. Units of radiation absorbed in the air?: Gya

38. The change in the x-ray beam as it travels through a patient?: attenuation

• photon tissue interaction that makes radiology possible because of it's creation of

contrast?: photoelectric interaction (fully absorbed = contrast)

40. Unit of radioactivity?: becquerel

41. unit of effective dose?: Sievert

42. Linear energy transfer ...: varies for different types of radiation

43. unit of Bq would be used in what imaging modality?: Nuclear medicine

• graphs that show relationship between radiation received and the organ- isms response?:

dose-response relationship

• Medical x-rays are examples of?: artificially produced radiation
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