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RADT465 Img Prod
ARRT registry review covering image production content area.
| Question | Answer |
|---|---|
| Image Intensifier's input phosphor size & material is... | Cesium Iodide (1); 25cm [no mag], 17cm [1 mag], 12 cm[2 mag] |
| Image Intensifier's output phosphor size & material is... | Zinc Cadmium Sulfide; 1-2.5cm (1) |
| What is the formular for brightness gain? | Flux gain X minification gain (1) |
| What is the only thing you can control in fluoroscopy? | TIME (1) |
| A 3 phase, 6 pulse circuit has a voltage ripple of... | 13-14% (1) |
| A 3 phase, 12 pulse circuit has a voltage ripple of... | 3-4% (1) |
| How is beam restriction (collimation) tested for QC? | 8 or 9 penny test (1) *good if + or - 2% of the SID |
| What is the QC parameter for central ray alignment? | + or - 1% of the SID (1) |
| How is linearity measured for QC? | dosimeter; has to be + or - 10% of SID (1) |
| How is reproducibility measured for QC? | dosimeter; has to be + or - 5% of SID (1) |
| How is the timer tested during QC? | Single phase = spinning top Three phase unit = synchronous timer *good if + or - 5% of SID (1) |
| How often should you clean casettes? | weekly (1) |
| How often are imaging plates erased? | every 24-48 hrs (1) |
| Optimal kVp for extremities on peds? | 60-70 (2) |
| Optimal kVp for small extremities? | 64(2) |
| Optimal kVp for medium extremities? | 72-76 (2) |
| Optimal kVp for large extremities? | 80-86 (2) |
| Optimal kVp for small parts of mandible or zygoma? | 76 (2) |
| Optimal kVp for skull? | 90 (2) |
| Optimal kVp for abdomen, pelvis, and lumbar? | 90 (2) |
| Optimal kVp for cervical and thoracic spine? | 86 (2) |
| Optimal kVp for chest with no grid or grid? | 86/120 (2) |
| Optimal kVp for barium based contrast media studies or with double contrast stu | 120 (2) |
| Reference 1 | Schmuck, H. (2023). RADT465 Unit 2: Equipment Operation and Quality Control Worksheet. (Unpublished course reference). University of Southern Indiana, Evansville, IN. |
| Reference 2 | Schmuck, H. (2023). RADT465 Unit 2: Relationship of All Radiographic Properties to Exposure Factors Packet.(Unpublished course reference). University of Southern Indiana, Evansville, IN. |
| What are the materials used for PSP imaging receptors? | Europium activated barium fluorohalide phosphors (2) |
| What are the pros to PSP imaging receptors? | High contrast resolution and they are light weight (2) |
| What are the cons to PSP imaging receptors? | you HAVE to collimate; sensitive plate, IR reader can get dirty and cause artifact (2) |
| What are the materials used for TFT imaging receptors? | Direct - amorphous selenium Indirect - amorphous silicon (2) |
| What are the pros to TFT imaging receptors? | Indirect - high spatial resolution and gain calibration Direct - high DQE and lower patient dose (2) |
| What are the cons to TFT imaging receptors? | costly, dead pixel errors (2) |
| What are the materials used for CCD/CMOS receptors? | scintillators and fiber optics, capacitators, and amplifiers (2) |
| What are the pros to CCD?CMOS receptors? | can replace pieces rather than entire IR, high spatial resolution, uses less power (2) |
| What are the cons to CCD/CMOS imaging receptors? | low DQE, low spatial resolution (2) |
| What is DQE? | Detective Quantum Efficiency; how fast an image can be made from its photons (2) |
| What is contrast resolution? | The range of grays an image can show (high or low) (2) |
| What is spatial resolution? | How many details can be seen on an image (high or low) ; lp/mm (2) |
| What is sampling frequency? | line pairs per millimeter; when this is higher, the image has better spatial resolution (2) |
| What is pixel pitch? | Measurement from the middle of one pixel to the middle of another (2) |
| What is rescaling? | pixels change to a defined scale to show the same amount of blacks, grays, and whites in an image (2) |
| What is flatscaling? | ensuring the same brightness throughout the image by altering the pixel values (2) |
| What is edge enhancement? | Defines fine details in an image; improves contrast resolution but could pick up scatter radiation (2) |
| What is equalization? | Getting rid of the most black and most white pixels in and image (2) |
| What is smoothing? | smooths out the image to get rid of noise (2) |
| What is the cast conversion for wet cast? | double mAs or increase kV 8-10 (2) |
| What is the cast conversion for a dry cast? | increase kV 5-7 (2) |
| What is the cast conversion for a fiberglass cast? | increase kV 3-4 (2) |
| As mAs increases what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure increases, no change on spatial resolution or distortion (2) |
| As kVp increase, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure increases, no change on spatial resolution or distortion (2) |
| As SID increases, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure decreases, spatial resolution increases, and distortion decreases (2) |
| As OID increases, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure decreases, spatial resolution decreases, and distortion increases (2) |
| As focal spot size increases, what happens to receptor exposure, spatial resolution, and distortion? | no change on receptor exposure or distortion; spatial resolution decreases (2) |
| As grid ratio increases, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure decreases and no change on spatial resolution or distortion (2) |
| As beam restriction increases, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure decreases and no change on spatial resolution or distortion (2) |
| As filtration increases, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure decreases and there is no change on spatial resolution or distortion (2) |
| As motion increases, what happens to receptor exposure, spatial resolution, and distortion? | spatial resolution decreases and there is no change on receptor exposure or distortion (2) |
| As anode heel effect increases, what happens to receptor exposure, spatial resolution, and distortion? | receptor exposure decreases and there is no change on spatial resolution or distortion (2) |
| As angle of the tube increases, what happens to receptor exposure, spatial resolution, and distortion? | spatial resolution decreases, distortion increases, and there is no change on receptor exposure (2) |
| What happens to receptor exposure with an additive pathology? | decreases (2) |
| What happens to receptor exposure with a destructive pathology? | increases (2) |
| what happens to receptor exposure with an increase in body habitus? | decrease (2) |
| What happens to spatial resolution with any kind of pathology? | decreases (2) |
| What happens to distortion when there is an increase in body habitus? | increases (2) |
| What happens to spatial resolution with an increase in body habitus? | decrease (2) |
Created by:
Mrlynn
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