マルチスライスCTにおける画質の基礎物理評価

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  • Evaluation of Physical Characteristics in Multi-slice CT

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This paper describes the results of a quality-of-image evaluation in multi-slice CT equipment. Image noise, section sensitivity profile (SSP), and spatial resolution of axial plane images were determined using two types of multi-slice CT equipment (Hispeed Advantage QX/I:GE-YMS Co. Ltd.; Aquilion: Toshiba Co. Ltd.). Suggestion: Based on theoretical considerations image noise was increased for helical pitch. Spatial resolution in the axial plane has been improved in the frequency domain by quarter-quarter offset reconstruction. Although slice thickness changed with helical pitch, as compared with a single CT, the profile has been improved notably. The limits of thin stratification of beam collimation and SSP evaluation by the bead method (point spread function using a small tungsten ball)were examined experimentally.

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