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 for all computed tomography systems, the food【敏感詞】drug administration recommends measuring the ct dose index (ctdi). each section of the cirs ct dose phantoms can provide separate dose information.  the user can also measure maximum, minimum【敏感詞】mid-range values of the nominal tomographic section thickness when performing dose profile measurements.

each phantom consists of a【敏感詞】of nesting 15 cm thick solid pmma disks measuring 16 cm (head)【敏感詞】32 cm (body) in diameter.  the adult head disk is also suitable for pediatric body measurements. the model 007a includes a third nesting disk measuring 10 cm in diameter for pediatric head measurements. handles on the body【敏感詞】head are provided for ease in handling【敏感詞】maneuverability.

through holes measuring 1.31 cm in diameter will accommodate standard ct probes. acrylic rods are provided to plug the holes when not in use. the acrylic rods are machined to receive 1 mm diameter tld rods.

the model 007 & 007a are manufactured to comply with the fda’s performance standard, 21 cfr 1020.33 that details the measurement requirements.the basic standard for ultrasound quality assurance.

the series of ultrasound phantoms, unlike human subjects【敏感詞】random scannable materials, offers a reliable medium which contains specific, known test objects for repeatable qualitative assessment of ultrasound scanner performance over time. this phantom is constructed from the patented solid elastic material zerdine®.

zerdine®, unlike other phantom materials on the market, is not affected by changes in temperature. it can be subjected to boiling【敏感詞】freezing conditions without sustaining significant damage. zerdine® is also more elastic than other materials【敏感詞】allows more pressure to be applied to the scanning surface without subsequent damage to the material. at normal【敏感詞】room temperatures, the zerdine® material found in the model 054 will accurately simulate the ultrasound characteristics found in human liver tissue.

designed to allow for axial resolution, lateral response width, uniformity, dead zone measurements, depth of visualization, high【敏感詞】low contrast mass imaging,【敏感詞】distance calibration. fully complies with all requirements【敏感詞】recommendation of the aium【敏感詞】acr.

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