Conventional Radiography Quiz

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Questions and Answers

What is the basic definition of digital imaging?

  • Any imaging process that can only be viewed on a lightbox
  • Any imaging process that produces an electronic image that can be viewed and manipulated on a computer (correct)
  • Any imaging process that involves the use of X-rays
  • Any imaging process that uses film and intensifying screens

What was the first medical imaging modality to become digital?

  • Ultrasound
  • X-ray
  • MRI
  • CT (correct)

What is the image formation process in conventional radiography?

  • Film is placed on one or between two intensifying screens that emit light when struck by X-rays (correct)
  • The film is placed on a lightbox for interpretation by a radiologist
  • The film is processed with chemicals and then viewed on a computer
  • The X-rays directly expose the film

What is the historical significance of CT in medical imaging?

<p>It brought about the coupling of the computer and imaging devices (D)</p> Signup and view all the answers

What is the purpose of intensifying screens in conventional radiography?

<p>To emit light when struck by X-rays (A)</p> Signup and view all the answers

What is exposure index in digital x-ray imaging?

<p>The amount of exposure received by the image receptor (A)</p> Signup and view all the answers

What is the purpose of standardized radiation exposure (KSTD) in digital x-ray imaging?

<p>To ensure equipment is functioning appropriately (C)</p> Signup and view all the answers

What is indicated equivalent air kerma (KIND) in digital x-ray imaging?

<p>The radiation measurement incident on the IR (C)</p> Signup and view all the answers

What is deviation index (DI) in digital x-ray imaging?

<p>The difference between the KIND and KTGT expressed logarithmically (D)</p> Signup and view all the answers

What is the significance of the median KIND value in digital x-ray imaging?

<p>It determines whether the IR was overexposed or underexposed (B)</p> Signup and view all the answers

What is target equivalent air kerma value (KTGT) in digital x-ray imaging?

<p>An optimal exposure for each specific body part and view (C)</p> Signup and view all the answers

What is the effect of adjusting technique on DI in digital x-ray imaging?

<p>Both A and B are correct (C)</p> Signup and view all the answers

What is the significance of reading pixel values (Q) in digital x-ray imaging?

<p>It can be affected by several variances (B)</p> Signup and view all the answers

What is the role of technologists in evaluating digital x-ray images?

<p>They must consult with a radiologist if in doubt about the image's quality (C)</p> Signup and view all the answers

What does exposure index refer to in digital x-ray imaging?

<p>The amount of exposure received by the image receptor (C)</p> Signup and view all the answers

What is standardized radiation exposure (KSTD)?

<p>A standard exposure typical of the imaging receptor system (C)</p> Signup and view all the answers

What is indicated equivalent air kerma (KIND)?

<p>The radiation measurement incident on the IR for that particular exposure (C)</p> Signup and view all the answers

What is the median KIND value used for in digital x-ray imaging?

<p>To determine whether the IR was overexposed or underexposed for that particular body part (A)</p> Signup and view all the answers

What is the target equivalent air kerma value (KTGT) used for in digital x-ray imaging?

<p>To establish the optimal exposure for each specific body part and view (C)</p> Signup and view all the answers

What is deviation index (DI)?

<p>The difference between KIND and KTGT expressed logarithmically (C)</p> Signup and view all the answers

What is the value of a perfect image according to the DI?

<p>0.0 (B)</p> Signup and view all the answers

How does adjusting technique affect KIND in digital x-ray imaging?

<p>-1 changes KIND by approximately 80% of the intended exposure (D)</p> Signup and view all the answers

What can affect reading pixel values (Q) in digital x-ray imaging?

<p>The size of the pixel, matrix, and FOV (A)</p> Signup and view all the answers

Which of the following is true regarding exposure index in digital X-ray imaging?

<p>It refers to the amount of radiation exposure received by the image receptor. (B)</p> Signup and view all the answers

What organizations have published reports on exposure indicator standardization?

<p>International Electrotechnical Commission (IEC) and American Association of Physicists in Medicine (AAPM) (D)</p> Signup and view all the answers

What is KSTD in digital X-ray imaging?

<p>The standard exposure typical of the imaging receptor system. (C)</p> Signup and view all the answers

What is KIND in digital X-ray imaging?

<p>The amount of radiation exposure received by the image receptor. (B)</p> Signup and view all the answers

What is KTGT in digital X-ray imaging?

<p>The optimal exposure for each specific body part and view. (C)</p> Signup and view all the answers

What is DI in digital X-ray imaging?

<p>The difference between KIND and KTGT expressed logarithmically. (B)</p> Signup and view all the answers

What is the value of a perfect image according to the DI in digital X-ray imaging?

<p>0.0 (D)</p> Signup and view all the answers

How does adjusting technique affect KIND in digital X-ray imaging?

<p>+1 changing KIND by approximately 125% of the intended exposure and -1 changing KIND by approximately 80%. (B)</p> Signup and view all the answers

What should technologists do if they are in doubt about the image's quality in digital X-ray imaging?

<p>Consult with a radiologist to determine if the image is of diagnostic quality. (D)</p> Signup and view all the answers

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Study Notes

Understanding Exposure Indicators and Standard Units of Measure in Digital X-ray Imaging

  • The size of the pixel, matrix, and field of view (FOV) are related and impact the size of the pixels in the image.
  • Exposure index refers to the amount of exposure received by the image receptor (IR), not the patient, and standardization is needed across manufacturers.
  • The International Electrotechnical Commission (IEC) and American Association of Physicists in Medicine (AAPM) have published reports on exposure indicator standardization.
  • Standardized radiation exposure (KSTD) is a standard exposure typical of the imaging receptor system, used to ensure equipment is functioning appropriately.
  • Indicated equivalent air kerma (KIND) is the radiation measurement incident on the IR for that particular exposure, derived from reading pixel values produced by the exposure.
  • Median KIND value is compared to the KSTD exposure to derive the KIND, which determines whether the IR was overexposed or underexposed for that particular body part.
  • Target equivalent air kerma value (KTGT) represents an optimal exposure for each specific body part and view, established by the system manufacturer or user.
  • Deviation index (DI) is the difference between KIND and KTGT expressed logarithmically, used to determine whether the image was underexposed or overexposed.
  • Technologists must evaluate the image and consult with a radiologist if in doubt about the image's quality, as DI is not the sole determining factor.
  • A perfect image according to the DI has a value of 0.0, and a negative DI indicates underexposure while a positive DI indicates overexposure.
  • Adjusting technique can change the DI, with +1 changing KIND by approximately 125% of the intended exposure and -1 changing KIND by approximately 80%.
  • Reading pixel values (Q) can be affected by several variances, so technologists must use their judgment in adjusting technical factors.

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