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RADT 456 ImageA&Eval
ARRT Registry Review
| Question | Answer |
|---|---|
| SID affects recorded detail how? | Recorded detail is directly related to SID |
| Grid interspace material can be made of what material? | aluminum and plastic fiber |
| True or false: An increase in kV will have more scattered radiation and the exposure rate will increase | True |
| The luminescent light emitted by the PSP is transformed into the image seen on the CRT by what? | ADC |
| Unopened boxes of radiographic film should be stored away from radiation and in what position? | vertical |
| X-ray photon energy is inversely related to what? | photon wavelength |
| Compared with a low ratio grid, a high ratio grid will do what? | Absorb more scattered and primary radiation |
| Subject/object unsharpness can't be a result of what? | anatomic objects of interest is/are in the path of the CR |
| Resolution in CR increases when: | laser beam size decreases and PSP crystal size decreases |
| What factors contribute to the efficient performance of a grid? | Grid ratio, number of lead strips per inch and amount of scatter transmitted through the grid |
| A 5 in. object to be radiographed at a 44 in. SID lies 6 in. from the IR. What will be the image width? | 5.7 in. |
| Causes of grid cut off: | inadequate SID |
| Using a short SID (25-30) with a large 14x17 IR will do what? | Increase the anode heel effect |
| Difference between CR and DR: | CR uses IP's |
| using a 48 in. SID, how much OID must be introducd to magnify an object two times? | 24 in. OID |
| The main difference between direct capture and indirect capture DR is what? | Direct capture/ conversion has no scintillator |
| What are methods of limiting the producton of scattered radiation? | Using the prone position for abdominal examinations and restricting the field size to the smallest practical size |
| The absorption of useful radiation by a grid is called what? | grid cutoff |
| What is a factor unrelated to recorded detail? | milliamperage |
| What is a pathological or abnormal condition that would require a decrease in exposure factors? | pneumonia |
| A 15% decrease in kV accompanied by a 50% increase in mAs will result in what? | shorter scale of contrast |
| Which factors impact recorded detail? | focal spot size, subject motion, and SOD |
| For the same FOV, as the matrix size increases: | spatial resolution increases, image quality increases and pixel size decreases |
| True or False: type of shape distortion include: magnification, elongation and foreshortening | False: magnification isn't one |
| Focal spot blur is greatest at what end | Toward the cathode end of the x-ray beam |
| How are mAs and patient dose related? | mAs and patient dose are directly proportional |
| Image plate front material can be made of what? | Carbon fiber and magnesium |
| Emphysema would require a decrease in exposure factors: true or false? | True |
| If a radiograph exposed using a 12:1 ratio grid exhibits increases brightness/ loss of density at its lateral edges, it is probably because of what? | SID was too great |
| What material may be used as grid interspace material? | Plastic and aluminum |
Created by:
eapurdue
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