RADT 1010 STUDY GUIDE QUESTIONS AND ANSWERS
GRADED A+
✔✔image brightness is determined by... - ✔✔the intensity of radiation striking the image
receptor
✔✔define contrast - ✔✔difference in density/difference in grayness of a radiographic
image
✔✔define subject contrast - ✔✔contrast of the subject compared to the surrounding
area in a radiographic image
✔✔what controls the penetration of x-rays through the body? - ✔✔kVp
✔✔name the 3 contrast agents used - ✔✔barium, iodine, air/gas
✔✔what does a grid do? - ✔✔absorbs scatter radiation
✔✔define spatial resolution - ✔✔the sharpness of lines/clarity in an image accurately
portrayed
✔✔what 3 things have the greatest impact on spatial resolution? - ✔✔1. SID
2. OID
3. patient motion
✔✔higher resolution occurs when... - ✔✔longest practical SID and lowest practical OID
is used
✔✔define distortion - ✔✔misrepresentation of the size or shape of the object being
examined
✔✔when size is distorted what occurs - ✔✔magnification
✔✔when shape is distorted what 2 things could occur - ✔✔foreshortening and
elongation
✔✔what causes radiographic distortion? - ✔✔SID, OID, beam alignment
✔✔what factor controls radiographic quantity? - ✔✔mAs
✔✔what factor controls radiographic penetration? - ✔✔kVp
✔✔Describe fluoroscopy. - ✔✔live-action view of the interior of the body
, ✔✔in fluoroscopy what is the image intensifier - ✔✔detector that receives the x-rays,
converts them to light and electronically brightens the image then sends it to the monitor
✔✔computed tomography provides... - ✔✔cross-sectional views of the body
✔✔magnetic resonance imaging provides... - ✔✔cross-sectional views of the body
without the use of ionizing radiation
✔✔nuclear medicine provides... - ✔✔images of major organs by introducing radioactive
material into the body
✔✔diagnostic medical sonography provides... - ✔✔sectional images of the body by
using high frequency sound waves
✔✔define luminescence - ✔✔to emit visible light
✔✔what are the two types of luminescence - ✔✔Phosphorescence and fluorescence
✔✔fluorescence glows only when... - ✔✔stimulated
✔✔in film 95% of the image is formed by.... - ✔✔light
✔✔define latent image - ✔✔invisible image on film before processing
✔✔define manifest image - ✔✔visible image on the film after processing
✔✔in CR a re-usable ________ captures the x-ray and converts it into _____ which is
then taken to the PSP and converted into an _____ - ✔✔screen, light, image
✔✔phosphors are from ______ ____________ ______ - ✔✔barium fluorohalide family
✔✔the active layer in CR photo stimulated plates is made of - ✔✔photo stimulated
phosphor
✔✔define recumbent - ✔✔lying down
✔✔define decubitus positions - ✔✔patient is recumbent and x-ray is horizontal
✔✔external preparation of the patient includes... - ✔✔removing jewelry or clothing that
may be covering the area where x-rays need to pass
✔✔internal preparation may include what 3 processes - ✔✔1. cleansing enemas
2. npo
GRADED A+
✔✔image brightness is determined by... - ✔✔the intensity of radiation striking the image
receptor
✔✔define contrast - ✔✔difference in density/difference in grayness of a radiographic
image
✔✔define subject contrast - ✔✔contrast of the subject compared to the surrounding
area in a radiographic image
✔✔what controls the penetration of x-rays through the body? - ✔✔kVp
✔✔name the 3 contrast agents used - ✔✔barium, iodine, air/gas
✔✔what does a grid do? - ✔✔absorbs scatter radiation
✔✔define spatial resolution - ✔✔the sharpness of lines/clarity in an image accurately
portrayed
✔✔what 3 things have the greatest impact on spatial resolution? - ✔✔1. SID
2. OID
3. patient motion
✔✔higher resolution occurs when... - ✔✔longest practical SID and lowest practical OID
is used
✔✔define distortion - ✔✔misrepresentation of the size or shape of the object being
examined
✔✔when size is distorted what occurs - ✔✔magnification
✔✔when shape is distorted what 2 things could occur - ✔✔foreshortening and
elongation
✔✔what causes radiographic distortion? - ✔✔SID, OID, beam alignment
✔✔what factor controls radiographic quantity? - ✔✔mAs
✔✔what factor controls radiographic penetration? - ✔✔kVp
✔✔Describe fluoroscopy. - ✔✔live-action view of the interior of the body
, ✔✔in fluoroscopy what is the image intensifier - ✔✔detector that receives the x-rays,
converts them to light and electronically brightens the image then sends it to the monitor
✔✔computed tomography provides... - ✔✔cross-sectional views of the body
✔✔magnetic resonance imaging provides... - ✔✔cross-sectional views of the body
without the use of ionizing radiation
✔✔nuclear medicine provides... - ✔✔images of major organs by introducing radioactive
material into the body
✔✔diagnostic medical sonography provides... - ✔✔sectional images of the body by
using high frequency sound waves
✔✔define luminescence - ✔✔to emit visible light
✔✔what are the two types of luminescence - ✔✔Phosphorescence and fluorescence
✔✔fluorescence glows only when... - ✔✔stimulated
✔✔in film 95% of the image is formed by.... - ✔✔light
✔✔define latent image - ✔✔invisible image on film before processing
✔✔define manifest image - ✔✔visible image on the film after processing
✔✔in CR a re-usable ________ captures the x-ray and converts it into _____ which is
then taken to the PSP and converted into an _____ - ✔✔screen, light, image
✔✔phosphors are from ______ ____________ ______ - ✔✔barium fluorohalide family
✔✔the active layer in CR photo stimulated plates is made of - ✔✔photo stimulated
phosphor
✔✔define recumbent - ✔✔lying down
✔✔define decubitus positions - ✔✔patient is recumbent and x-ray is horizontal
✔✔external preparation of the patient includes... - ✔✔removing jewelry or clothing that
may be covering the area where x-rays need to pass
✔✔internal preparation may include what 3 processes - ✔✔1. cleansing enemas
2. npo
