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Image Acquisition
Image Acquisition and Evaluation
| Question | Answer |
|---|---|
| Distortion can be caused by what? Q239 pg229 | Tube angle, the position of the organ or structure in the body, the radiographic positioning of the part |
| How often are radiographic equipment collimators required to be evaluated? Q222, pg 226 | Semiannually |
| IRs frequently have a rear lead-foil layer that functions to do what? Q219, pg 226 | Absorb backscatter |
| The continued emission of light by a phosphor after the activating source has ceased is termed? Q220, pg 226 | Phosphorescence |
| What is a compensating filter used for? Q203, pg 224 | To even out widely differing tissue densities |
| Boxes of film stored in too warm an area may be subject to what kind of artifact? Q204, pg 224 | Fog |
| The line-focus principle expresses the relationship between what 2 things? Q215, pg 225 | The actual focal spot and the effective focal spot |
| What happens to contrast as the grid ratio is decreased? | The scale of contrast gets longer |
| What are the unsharp edges of tiny radiographic details called? | Blur |
| To make a perceptible increase in radiographicdensity, what must be increased and by how much? | mAs must be increased by 30% |
| If an anatomic structure appears smaller on the IR than its actual size, it is? | Foreshortened |
| How will a decrease in kV affect a radiograph? | A decrease in contrast |
| The relationship between the height of a grid's lead strips and the distance between them is referred to as? | Grid Ratio |
| Due to the anode heel effect, the intensity of the x-ray beam is greatest at which end of the beam? | Cathode side |
| The processing algorithm represents what? | Image grayscale |
| In digital imaging, as DEL size decreases, spatial resolution does what? | Increases |
| The x-ray image seen on the computer display monitor is a what? | Analog Image |
| What accessory is used to measure the thickness of body parts in order to determine optimal selection of exposure factors is? | A Caliper |
| Windowing of a digital image determines what? | Contrast |
| The purpose of the electroconductive layer of a CR PSP plate is to? | Facilitate transportation through the scanner/reader |
| The intensity of ionizing radiation decreases as the distance from the source? | Increases |
| If a lateral projection of the chest is being performed on an asthenic patient and the outer photocells are selected, what is likely to be the outcome? | Decreased Density |
| Which device is used to compensate for variations in patient anatomy? | Compensating Filter |
| Would you increase or decrease technique for Osteoporosis? | Decrease |
| The reduction in x-ray photon intensity as the photon passes through material is known as what? | Attenuation |
| Would you increase or decrease technique for Emphysema? | Decrease |
| The absorption of useful radiation by a grid is called? | Grid Cutoff |
| During CR imaging, the latent image present on the PSP is changed to a computerized image by the? | ADC |
| Focal spot blur is greatest towards which end of the x-ray tube? | Cathode End |
| The direction of electron travel in the x-ray tube is? | Cathode to Anode |
Created by:
agerling
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