FREE RADIOLOGY AND STUDY GAMES ABOUT DIGITAL

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FREE RADIOLOGY AND STUDY GAMES ABOUT DIGITAL

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -69 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Quality assurance

Answer:

a plan for the systemic observation and assessment of the different aspect of a project, service, or facility to make certain that standards of quality are being met. focus on people

Question 2: Edge enhancement

Answer:

high-pass filtering or masking; occurs when fewer pixels in the neighborhood are included in the signal average. amplify particular known frequencies in an image while suppressing others.

Question 3: CR reader (Image plate reader)

Answer:

reads and digitizes the image using a laser

Question 4: Exposure index number

Answer:

calculated how much radiation was absorbed; the amount of light given off or electric signal by x-ray photons received, converted and calculated.

Question 5: Detector element

Answer:

AKA DEL, pixel-sized piece of information

Question 6: Matrix

Answer:

a rectangular or square table of numbers that represent the pixel intensity to be displayed on the monitor.

Question 7: DI

Answer:

deviation index- the difference between the actual exposure (K ind) and the target exposure (K tgt)

Question 8: HL-7

Answer:

Health level 7, standard protocol used for medical data system

Question 9: air kerma

Answer:

kinetic energy released per unit mass (joules) absorbed in unit of air, expressed as j/kg or gray (Gy)

Question 10: digital imaging

Answer:

any imaging acquisition process that produces an electronic image that can be viewed, manipulated on a computer

Question 11: CNR

Answer:

contrast to noise ratio, a measure used to image quality

Question 12: resolution

Answer:

a number of pixels contained on a display

Question 13: brightness

Answer:

level of intensity of a digital image on a display monitor

Question 14: Bit depth

Answer:

the number of bits stored per pixel; the shades of gray available for each pixel

Question 15: automatic rescalling

Answer:

occurs when exposure is greater or less than the optimal amount to produce diagnostic image, fix exposure errors

Question 16: Hard drive

Answer:

main repository or storage for programs and documents on the computer

Question 17: Voxel

Answer:

volume element; individual pixel with the associated volume of tissue based on the slice of thickness

Question 18: Byte

Answer:

made up of 8 bits and the amount of memory needed to store one alphanumeric character

Question 19: SMPTE pattern

Answer:

Society of Motion Pictures and Television Engineers test pattern-used to determine if the monitor is playing any distortion over the display

Question 20: WAN

Answer:

Wide area network- network that spans a large area, city, state, nation continent or world

Question 21: stitching

Answer:

software that combine multiple images together

Question 22: Indirect digital radiography

Answer:

• steps process where x-ray photons are converted to light in the scintillation layers which contained

either gadolinium oxysulphide (Gd2O2S) or cesium iodide (CsI) and then the light photons are converted to an electric signal though photo-detector.

Question 23: TFT

Answer:

thin-film transistor; a photo detector that converts light into electrical charges.

Question 24: LAN

Answer:

local area network, small area network with cables or wireless access points so that computers can share information and devices on the same network.

Question 25: Smoothing

Answer:

low-pass filtering, averaging surrounding pixel to remove high frequency noise, reduction of noise and contrast

Question 26: Digital radiography

Answer:

cassette less systems that use an x-ray absorb material coupled to a flat-panel detector or CCD to form an image

Question 27: Computed radiography

Answer:

the digital acquisition modality that uses storage phosphor plate to produce projection images.