focal spot

spot

[spot] a circumscribed area or place, usually distinguished by its color; see also macula and tache.actual focal spot the section of a focal spot on which there is intersection of an electron beam with an anode of an x-ray tube.Bitot's s's foamy gray triangular spots of keratinized epithelium on the conjunctivae, a sign of vitamin A deficiency.blind spot 1. optic disk.2. mental scotoma.café au lait spot a light brown pigmented macule seen in neurofibromatosis and albright's syndrome.cherry-red spot the choroid appearing as a red circular area surrounded by gray-white retina, as viewed throught the fovea centralis in tay-sachs disease. Called also Tay's spot.cotton-wool spot white or gray soft-edged opacities in the retina composed of cytoid bodies; seen in hypertensive retinopathy, lupus erythematosus, and numerous other conditions.effective focal spot the size of a projected focal spot in a specified direction measured with a quality assurance test tool such as the slit camera.focal spot 1. the object of a patient's gaze during distraction techniques.2. a small area of an x-ray target that receives the main electron stream.Forschheimer s's a fleeting skin eruption consisting of discrete rose spots on the soft palate sometimes seen in rubella just prior to the onset of the skin rash.Koplik's s's small, irregular, bright red spots on the buccal and lingual mucosa, with a minute bluish white speck in the center of each; they are pathognomonic of beginning measles.liver spot 1. a lay term for lentigo" >senile lentigo.2. (in pl.) tinea versicolor.mental blind spot mental scotoma.mongolian spot a type of congenital brown to gray-blue nevus; see also mongolian spot.Roth's s's round or oval white spots consisting of coagulated fibrin seen in the retina in a number of diseases in which a vascular insult resulting in hemorrhage is followed by healing.Tay's spot cherry-red spot.

fo·cal spot

the site of bombardment by electrons and emission of x-rays from the anode of an x-ray tube.
See also: focal spot size.

fo·cal spot

(fō'kăl spot) The area made of tungsten on the anode of a diagnostic x-ray tube. The electrons interact with it to produce x-rays.

fo·cal spot

(fō'kăl spot) The area made of tungsten on the anode of a diagnostic x-ray tube. The electrons interact with it to produce x-rays.

单词	focal spot
释义	DictionarySeespot focal spot focal spot [′fō·kəl ‚spät] (metallurgy) In electron-beam or laser welding, the spot where the beam has the highest concentrated energy level. focal spot spot [spot] a circumscribed area or place, usually distinguished by its color; see also macula and tache.actual focal spot the section of a focal spot on which there is intersection of an electron beam with an anode of an x-ray tube.Bitot's s's foamy gray triangular spots of keratinized epithelium on the conjunctivae, a sign of vitamin A deficiency.blind spot 1. optic disk.2. mental scotoma.café au lait spot a light brown pigmented macule seen in neurofibromatosis and albright's syndrome.cherry-red spot the choroid appearing as a red circular area surrounded by gray-white retina, as viewed throught the fovea centralis in tay-sachs disease. Called also Tay's spot.cotton-wool spot white or gray soft-edged opacities in the retina composed of cytoid bodies; seen in hypertensive retinopathy, lupus erythematosus, and numerous other conditions.effective focal spot the size of a projected focal spot in a specified direction measured with a quality assurance test tool such as the slit camera.focal spot 1. the object of a patient's gaze during distraction techniques.2. a small area of an x-ray target that receives the main electron stream.Forschheimer s's a fleeting skin eruption consisting of discrete rose spots on the soft palate sometimes seen in rubella just prior to the onset of the skin rash.Koplik's s's small, irregular, bright red spots on the buccal and lingual mucosa, with a minute bluish white speck in the center of each; they are pathognomonic of beginning measles.liver spot 1. a lay term for lentigo" >senile lentigo.2. (in pl.) tinea versicolor.mental blind spot mental scotoma.mongolian spot a type of congenital brown to gray-blue nevus; see also mongolian spot.Roth's s's round or oval white spots consisting of coagulated fibrin seen in the retina in a number of diseases in which a vascular insult resulting in hemorrhage is followed by healing.Tay's spot cherry-red spot. fo·cal spot the site of bombardment by electrons and emission of x-rays from the anode of an x-ray tube. See also: focal spot size. fo·cal spot (fō'kăl spot) The area made of tungsten on the anode of a diagnostic x-ray tube. The electrons interact with it to produce x-rays. fo·cal spot (fō'kăl spot) The area made of tungsten on the anode of a diagnostic x-ray tube. The electrons interact with it to produce x-rays.
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