bowtie filter

bowtie filter

[bō′tī]
a filter shaped like a bowtie that may be used in computed tomography to compensate for the shape of the patient's head or body. It is used with fan-shaped x-ray beams to equalize the amount of radiation reaching the film.
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Whenever possible the field of view (FOV) on the axial plane is limited to 25 cm in addition to using a proper size cardiac bowtie filter (small for GE scanners and medium for Toshiba Aquilion One scanner) so that the X-ray beam can be limited mostly to cardiac structures (20-22).
For example, the use of a proper bowtie filter was suggested as an important measure for limiting radiation dose in a letter communication by Budoff et al.