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What are the geometric factors of film screen and digital imaging
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RADT 456 Liz Delong
Image Acquisition and Evaluation II
| Question | Answer |
|---|---|
| What are the geometric factors of film screen and digital imaging pp.298 | OID, SID, Focal spot size, Distortion, Structural position and shape, and motion |
| Recorded Detail pp. 298 | Clarity or resolution with which anatomic structures are represented in the image |
| What is the term used for CR/DR recorded detail pp. 299 | Spatial resolution |
| Distortion pp.299 | Misrepresentation of the actual size or shape of the structures imaged |
| What is a border of unsharpness around image details pp. 305 | focal spot blur or edge gradient |
| What is the purpose of intensifying screens pp.310 | Reduce the required exposure to a fraction of the original exposure |
| What is the active ingredient in the intensifying screens pp.311 | Fluorescent phosphors |
| Radiographic density pp.314 | overall amount of blackening on a radiographic image |
| What is the signal most important technical factor associated with density? pp.317 | mAs |
| What is the formula for the inverse square law pp. 319 | I1/I2=d2^2/d1^2 |
| What is the density maintenance formula pp. 319 | mAs1/mAs2=d1^2/d2^2 |
| Quality and Quantity of an x-ray beam is affected by what pp. 320 | kV |
| What type of interaction is responsible for scattered radiation pp. 322 | Compton interaction |
| What is grid ratio pp.326 | the height of the lead strips compared with the distance between them |
| What type of environment and temperature should unexposed film be stored in? pp.381 | cool and dry environment and under 70 F |
| Guide shoes or deflector plates allow fil to change direction. Guide shoes sometime leave marks, what are those marks called? pp.387 | Guide shoe marks |
| What is a histogram pp.394 | A graphic representation of pixel value distribution |
| Window width changes affect what? pp. 396 | Changes in the number of gray shades |
| Window level changes affect what? pp. 396 | Affects change in the image brightness |
| Windowing refers to what? pp.406 | Some change made to window width and/or window level |
| Processing artifact pp.419 | artifact caused by chemical processing of film |
| Wire mesh test pp.383 | Screen must be tested periodically for screen-film contact |
| Dynamic range or pixel range is related to what? pp.355 | shades of gray |
| Fixed kV technique chart pp352 | A chart that specifies a particular kV for each body part or type of exam, it will provide adequate penetration and the appropriate scale of contrast |
| Additive pathology pp. 351 | increases tissue density, requiring an increase in exposure factors |
| Atelectasis is an example of what type of pathology pp. 351 | additive pathology |
| Degenerative pathology pp.351 | deterioration of the part, requiring a decrease in exposure factors |
| An example of degenerative pathology pp.351 | osteoporosis |
| What is the function of a grid? pp. 347 | Removes scatter radiation exiting the patient before it reaches the IR, improving contrast |
| What are the 3 factors that have a significant effect on the production of scattered radiation pp.344 | beam restriction, kv, and thickness and density of tissues |
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esdelong
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