lesson 6

Question 1

Ways by which getting radiographic image

Answer 1

IMAGE ACQUISITION

Question 2

RAW DATA ACQUISITION Involves THREE STEPS

Answer 2

• Positioning
• Exposure Field Alignment & Collimation
• Exposure Technique Selection

Question 3

• a graphical display
  of the pixel intensity distribution for a digital image.
• A plots the number of pixels found at each pixel value

Answer 3

Histogram

Question 4

3 steps a Radiologic Technologist must correctly ensure before exposing the patient to radiation

Answer 4

1. Positioning
2. Exposure Field Alignment
   and Collimation
3. Exposure Technique Selection

Question 5

refers to the range of X-ray intensity that the detector can image. To obtain high-quality digital radiographs, radiographic detectors that give good contrast over a wide dynamic range are required

Answer 5

Dynamic Range

Question 6

is a type of radiographic
noise directly related to the number of x-ray photons exiting the patient and
forming the radiographic image

Answer 6

Quantum Mottle/ Quantum Noise

Question 7

refers to unwanted signals that corrupt, mask, or interfere with the desired signal which is being processed by an electronic
circuit

Answer 7

Electronic Noise

Question 8

• they contain quantum
  mottle (noise), appear
  under-penetrated and often are deemed to be undiagnostic
• appear ‘grainy,’ and display poor penetration

Answer 8

Underexposure

Question 9

will have a distinct lack of quantum mottle while appearing ‘saturated’ or in extreme cases ‘burnt out’ whereby anatomy is completely obliterated from the radiograph

Answer 9

Overexposure

Question 10

Foreign materials on the light collection guide in a CR reader produces bright linear lines in the output image

Answer 10

Artifacts

Question 11

a patient-based artifact that occurs with voluntary or involuntary patient movement during image acquisition

Answer 11

Motion Artifact

Question 12

Visual inconsistencies or errors that occur at the boundaries where the
individual images are merged together

Answer 12

Stitching Artifacts

Question 13

Latent image from previous
exposure present on current exposure

Answer 13

Detector image lag or ghosting

Question 14

electronics are visible on the exposed image

Answer 14

Backscatter

Question 15

Where a detector element fails to receive a proper signal and therefore appears as a bright white
dot in an x-ray image

Answer 15

Dead pixel artifact

Question 16

• large areas of signal loss
• due to detector drop

Answer 16

Signal Dropout/ Speckled Radiopaque Spot