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RADT 456 Image Acqui
ARRT Registry Review
| Question | Answer |
|---|---|
| What are the three rare earth phosphors? | Gadolinium, Lanthanum, Yttrium |
| True or false, intensifying screens are a part of SF imaging as well as CR imaging? | False, SF only |
| Describe the Inverse Square Law. | The intensity of light at a particular distance from its source is inversely proportional to the square of the distance |
| What are the three things that x-ray photons can do? | Penetrate, scatter, absorb |
| What are the two types of grids? | stationary and moving |
| The primary beam has a total filtration rate of how much? | 2.5 mm Al |
| What are some examples of inherent filtration? | glass envelope and the collimator |
| Are the following pathologies additive or destructive? Ascites, Rheumatoid Arthritis, Paget Disease, Pneumonia, Atelectasis, Congestive Heart Failure, Edematous Tissues | Additive |
| When changing from a single phase to three phase 12 pulse, what happens to the mAs? | The mAs is 1/2 as much |
| When changing from a single phase to a three phase 6 pulse, what happens to the mAs? | The mAs is 2/3 less |
| What happens during the Anode Heel Effect? | The thicker body portion is placed under the cathode end of the x-ray beam |
| What is the function of contrast? | To make detail of the image visible |
| High contrast is... | short scale and lower kV |
| Low contrast is... | long scale and higher kV |
| What are two types of AECs? | Phototimer and Ionization chamber |
| Name the fixed kVs for the following: skull, abdomen, lateral lumbar, barium studies, and chest examinations? | extemities- 55 skull-75 abdomen-75 lateral lumbar-90 barium studies-120 chest exams-120 |
| What are the advantages of SF systems? | high spatial resolution and image consistency |
| What is a pixel? | 2 dementional picture element |
| What is a voxel? | 3 dementional volume element |
| What is a matrix? | number of pixels |
| What is the field of view? | the amount of the part or patient that is included in the matrix |
| CR spatial resolution improves with? | smaller pixel pitch, greater pixels/mm, and greater sampling frequency |
| What are the layers of the PSP storage plate? | protective coat, phosphors in binder material, reflective backing, polyester base support material, antistatic layer, and lead foil backing |
| What are the terms used in CR/DR imaging that are assoiciated with the SF imaging terms of Latitude, Contrast, Density, Recoreded detail/Sharpness, and resolution? | Dynamic range, Contrast resolution, Brightness, SNR, and Spatial frequency |
| CR resolution increases as... | PSP phosphor size decreases, laser beam size decreases, and monitor matrix size increases |
| What are the types of artifacts? | Handling, Processing, and Exposure |
| What are the 4 parts required to be included on the x-ray image? | patient name/ ID number, side marker, examination date, and institution's name |
| What order does the film run through the processor? | Developer, Fixer, Wash, and Dryer |
| What are the two types of silver recovery? | Electrolytic and Metallic displacement |
| What is a histogram? | An analysis and graphic representation of all the densities from the PSP screen, demonstrating the quantity of exposure, the number of pixels, and their value |
| CR resolution increases as... | PSP phosphor size decreases, laser beam size decreases, and monitor matrix size increases |
Created by:
cjschaeffe
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