MEDRADSC 3H03 Lecture Notes - Lecture 5: Detent, Stereoscopy, International Commission On Radiological Protection
8 Feb 2018
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Leakage radiation: beam limiting devices, grid alignment, focal spot size, hvl. Leakage radiation: x-rays leaving the tube anywhere other than our window, will affect image quality, just adds noise, not useful information, sc35 b. 2. 5. 1. 8. 8. , 9. (pg. 25: stepless adjustment- continuous, can put it to wherever we want, min. X-ray field size < 5 cm x 5 cm: use light field to show limits of x-ray field. Light field visible under ambient lighting: separation of perimeter of light field from x-ray field, within 2% of the sid when x-ray beam perpendicular to ir, usually test at 100 sid, so it should be within 2cm. Sc35 - c. 3. 6. 2: y. 8 (pg 53) (annually tested- y tells us) Light field and x-ray field alignment light localizer to define outline of x-ray field: misalignment of visually defined field with edges of x-ray field not exceed 2% of focal spot to image receptor distance.
