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RADT 456-Image Eval

ARRT registry review covering image production and evaluation

QuestionAnswer
True or False. Pixel size is determined by dividing the FOV by the matrix. True
What pixel size has a 512 x 512 matrix with a 10 cm FOV? .19 mm/pixel
True or False. The FOV and matrix size are dependent upon each other? False. They have a independent relationship. A change can occur between one without affecting the other
What are two common materials used to construct grid interspaces? Aluminum and plastic fiber
True or False. SID is directly related to recorded detail. True
Going from a 14 x 17 in field size to a 8 x 10 excluding any other changes, will Decrease the amount of scattered radiation generated within the part
What exposure factor group will produce the most radiographic density: 600 mA, 30 ms 400 mA, 70 ms 400 mA, 70 ms
What is the function of the photostimulable phosphor? Records the actual radiologic image. It is a component of the IP.
DEXA is also known as? Dual x-ray absorptiometry
The luminescent light emitted by the PSP is transformed into the image seen on the CRT by what? ADC. Analog to digital converter
What does the term windowing describe? Changing the image brightness and/or contrast scale
What can cause foreshortening to occur? The radiographic object being placed at an angle to the IR
Each cm increase in patient thickness requires what adjustment to kVp? Increase of 2 kVp
How should unopened boxes of radiographic film be stored? Away from radiation in a vertical position
What can occur if film is improperly stored and stacked upon each other? Pressure marks
True or False. Film emulsion is much more sensitive to safelight fog after exposure True
What is the relationship between photon energy and wavelength? Inversely related. As energy increases the wavelength decreases
When comparing a 8:1 grid to a 16:1 grid ratio, the 16:1 will Absorb more primary radiation and scattered radiation
What is the definition of grid ratio? The height of the lead strips to the width of the interspace material
What occurs when image details are placed away from the path of the CR that become exposed by more divergent rays? Rotation distortion
What are the two types of shape distortion? Elongation and foreshortening
When does resolution in CR increase? As the laser beam size decreases and the PSP crystal size decreases
Which pathological condition would require an increase in exposure technique: Emphysema or Atelectsis Atelectasis
Which pathological condition would require a decrease in exposure technique: pneumoperitoneum or pneumonia? Pneumoperitoneum
True or False. Field size affects exposure rate of the primary beam. False. The exposure rate is affected by distance, kilovoltage and milliamperage.
When using a focused reciprocating grid, what causes grid cutoff? Inadequate SID
What can occur if the developer temperature is too high? Chemical fog can occur as a result of less/unexposed silver halide crystals being reduced
Greater latitude is available with the use of? Low grid ratios or using high kv technical factors
The term FOV describes what? How much of the patient is included in the matrix
For the same FOV, when will spatial resolution be improved? When using a large or small matrix? Large matrix
Focal spot size, OID and SID are related to? Recorded detail
What is the relationship between mAs and patient dose? Directly proportional. As mAs increases-patient dose increases.
Created by: kjschapker