| Summary: | 碩士 === 中山醫學大學 === 生物醫學科學學系碩士班 === 100 === The traditional spiral scans of computer tomography using a single energy, and recently the Siemens CT using dual-energy scanning protocol apply to arterial phase scan of liver triple-phase examination, and improve the diagnosis rate of the lesion. The Toshiba CT has a 320-row detector, the lap maximum scan range of up to 16 cm, can be an extension of the wide volume scan. The study use Siemens CT and Toshiba CT to evaluate the effective dose of the liver triple-phase examination. In image quality evaluation, the study use the dual energy mode of Siemens CT and the wide-volume mode of Toshiba CT to scan Catphan phantom and reconstruct image by FBP and IR mode to compare their traditional spiral scan mode.
The Rando phantom filled with TLDs to evaluate dose in the liver triple-phase examination. In addition, the experiment also used a single topogram scan protocol to assess the doses of the liver triple-phase examination. The Catphan phantom with self-made body annulus phantom was scanned by the AEC system and the 12 manual dose modes to evaluate the image quality of the four scan mode.
In clinical examinations of the liver triple-phase, the lowest effective dose is in Siemens CT, the next is the wide-volume mode of Toshiba CT and the helical mode of Toshiba CT. In the FOMCNR of AEC mode reconstructed by FBP method, the best of FOMCNR is the dual energy scan mode of Siemens CT, and the next is the helical mode of Toshiba CT. If we use the IR mode of image reconstructions, the best of FOMCNR is also the dual energy scan mode of Siemens CT, and the next is the single energy scan mode of Siemens CT and the wide-volume mode of Toshiba CT.
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