IMAGE PRODUCTION AND EVALUATION
questions well answered already passed updated
1. Density The amount of blackness on a given area of a radiographic image, either
film-screen or digital
2. kVp Controls the energy of x-rays produced, also has a direct impact on
density, although not proportional; governed by the 15% rule
3. Source-to-image
distance Distance from the x-ray tube anode to the image receptor, attects
density through the inverse square law; controls magnification and image
blur; the longer the SID, the better the recorded detail
4. Film-screen com-
bination
In analog imaging, the speed of the film-screen combination has a direct
ettect on density
5. Grids Absorb scatter radiation; this has an impact on the density and contrast
of the image
6. Beam restriction Limits the size of the area of the x-ray beam; attects density and
contrast by reducing the amount of scatter produced
7. Anode heel effect Has some ettect on density when a large field is exposed
8. Film Processing Can adversely attect density through various malfunctions
9. Contrast Ditterences in adjacent densities on the radiographic image
10. High Contrast Few gray tones, mainly black and white image; may also be referred to
as
short-scale contrast; produced at lower kVp
11. Low contrast Many gray tones on image; may also be referred to as long-scale
contrast; pro- duced at higher kVp
12. Subject Contrast Controlled by anatomy and pathology; attects contrast through variations
of atomic number, tissue thickness, and tissue density
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4
, IMAGE PRODUCTION AND EVALUATION
questions well answered already passed updated
13.
1/
4
questions well answered already passed updated
1. Density The amount of blackness on a given area of a radiographic image, either
film-screen or digital
2. kVp Controls the energy of x-rays produced, also has a direct impact on
density, although not proportional; governed by the 15% rule
3. Source-to-image
distance Distance from the x-ray tube anode to the image receptor, attects
density through the inverse square law; controls magnification and image
blur; the longer the SID, the better the recorded detail
4. Film-screen com-
bination
In analog imaging, the speed of the film-screen combination has a direct
ettect on density
5. Grids Absorb scatter radiation; this has an impact on the density and contrast
of the image
6. Beam restriction Limits the size of the area of the x-ray beam; attects density and
contrast by reducing the amount of scatter produced
7. Anode heel effect Has some ettect on density when a large field is exposed
8. Film Processing Can adversely attect density through various malfunctions
9. Contrast Ditterences in adjacent densities on the radiographic image
10. High Contrast Few gray tones, mainly black and white image; may also be referred to
as
short-scale contrast; produced at lower kVp
11. Low contrast Many gray tones on image; may also be referred to as long-scale
contrast; pro- duced at higher kVp
12. Subject Contrast Controlled by anatomy and pathology; attects contrast through variations
of atomic number, tissue thickness, and tissue density
1/
4
, IMAGE PRODUCTION AND EVALUATION
questions well answered already passed updated
13.
1/
4
