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RADT 465: Img. Acq.
ARRT registry review of Image Acquisition and Evaluation
Question | Answer |
---|---|
What devices can evaluate geometric blur? P. 195 | Star pattern, Slit camera, Pinhole camera. P. 232 |
In electronic imaging, what happens when image matrix size increases? P. 195 | Pixel size decreases p. 232 |
SID affects recorded detail in which way? p. 196 | Recorded detail is directly related to SID p. 233 |
The luminescent light emitted by teh PSP is transformed into the image seen on the CRT by the...? p. 197 | ADC p. 235 |
Unopened boxes of radiographic film should be stored away from radiation and in what position? p. 199 | Vertical p. 236 |
Name a few pathologic or abnormal conditions that would require an increase in exposure factors? p. 201 | Atelectasis, Paget disease, Congestive heart failure p. 238 |
The direction of electron travel in the x-ray tube is...? p. 205 | Cathode to anode p. 242 |
For the same FOV, spatial resolution will be improved using what? p. 205 | A larger matrix p. 242 |
Focal-spot blur is greatest where? p. 207 | Toward the cathode end of the x-ray beam p. 246 |
What is the correct order of radiographic film processing? p.209 | Developer, fixer, wash, dry p. 247 |
The reduction in x-ray photon intensity as the photon passes through material is termed? p. 209 | Attenuation p. 248 |
The intensity of ionizing radiation decreases as? p. 211 | Distance from the source of radiation increases p. 250 |
Diagnostic x-rays are generally associated with? p. 210 | High frequency and short wavelength p. 248 |
What has the widest dynamic range? p. 213 | CR p. 253 |
What is the purpose of the thin layer of lead that is often located in the rear portion of an IP? p. 213 | To prevent scattered radiation fog p. 252 |
A focal-spot size of .3 mm or smaller is essential for? p. 214 | Magnification radiography p. 254 |
How is OID realated to recorded detail? p. 215 | Radiographic detail is inversely related to OID p. 255 |
The relationship between the height of a grid's lead strips and teh distance between them is referred to as grid what? p. 217 | Ratio p. 258 |
What requires two exposures to evaluate focal-spot accuracy? p. 217 | Slit camera p. 257 |
In digital imaging, as DEL size decreases...? p. 216 | Spatial resolution increases p. 256 |
A decrease in kilovoltage will result in? p. 218 | A decrease in optical density p. 260 |
Why is a very short exposure time essential in chest radiography? p. 220 | To minimize involuntary motion p. 263 |
In digital imaging, TFT DEL size is related to? p. 221 | Spatial resolution p. 264 |
The purpose of the electroconductive layer of a CR PSP plate is to? p. 221 | Facilitate transportation through the scanner/reader p. 265 |
To produce a just perceptible increase in radiographic density, the radiographer must increase the? p. 222 | mAs by 30% p. 265 |
When involuntary motion must be considered, the exposure time may be cut in half if the kilovoltage is? p.223 | Increased by 15% p. 267 |
Which interaction is responsible for producing the most x-ray photons at the x-ray tube target? p. 224 | Bremsstrahlung p. 268 |
The line-focus principle expresses the relationship between? p. 225 | The actual and the effective focal spot p. 270 |
Exposed silver halide crystals are changed to black metallic silver by the? P. 226 | Reducers p. 271 |
As window level increases...? p. 229 | Brightness increases p. 273 |