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Image quality
| Question | Answer |
|---|---|
| List the four image quality factors of a radiograph | Density Contrast Spatial resolution Distortion |
| The range of exposure over which a film produces an acceptable image | Exposure latitude |
| Which specific exposure factor controls the quality or penetrating ability of the xray beam? | kV |
| The anoint of blackness seen on a processed radiograph is called | Density |
| The primary controlling factor for the overall blackness on a radiograph is | mAs |
| If the distance between the xray tube and IR is increased from 40 to 80 inches, what specific effect will it have on the radiographic density, if other factors are not changed? | Decrease density to 25% |
| What term is used to describe a radiograph that has too little density? | Underexposed |
| Doubling the mAs will result in ___________ the density on the IR image | Doubling |
| True/false kV must be altered to change radiographic density on the IR image | False |
| According to the anode heel effect, the xray beam is less intense at the __________ end of the xray tube. | Anode |
| To best use the anode heel effect, the thicker part of the part should be placed under the __________ end of the xray tube | Cathode |
| What device or method may be used to compensate for the past thickness difference and produce an acceptable density on the IR image? | Compensating filter |
| The difference in density on adjacent areas of the radiograph defines__________ | Contrast |
| What is the primary controlling factor for radiographic contrast? | kV |
| List the two scales of radiographic contrast,identify which is high contrast and which is low contrast | Long scale (low) Short scale (high) |
| True/false A low contrast image demonstrates more shades of gray on the radiograph | True |
| The recorded sharpness of structures or objects on the radiograph defines________ | Spatial resolution |
| The lack of visible sharpness is called__________ | Blur or unsharpness |
| List the three geometric factors that control or influence image resolution | Focal spot size SID OID |
| The term that describes the unsharp edges of the projected image is | Penumbra |
| The greatest contributor to image unsharpness as related to positioning is | Motion |
| What is the best mechanism to control involuntary motion during an exposure? | Shorten exposure time |
| What will improve image resolution? A. Decrease OID. B. Decrease SID. C. Use large focal spot. D. Use higher kV | A. Decrease OID |
| The misrepresentation of an object size or shape projected onto a radiographic recording medium is called | Distortion |
| List the four primary controlling factors for distortion. | SID OID CR alignment Object IR alignment |
| True/false A decrease in SID reduces distortion | False |
| True/false An increase in OID reduces distortion | False |
| Distortion is reduced when the central ray is kept perpendicular to the plane of the IR | True |
| List the six image quality factors of digital imaging | Brightness. Contrast resolution Spatial resolution. Distortion Exposure indicator. Noise |
Created by:
Pixiegirl73
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