不均等型検出器を有するmulti-slice CTのSSPzと画像ノイズの基礎的検討

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  • Basic Examination of Section Sensitivity Profile on Z-axis and Image Noise in Multi-slice CT Using Asymmetric-type Detector

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Our goal in this study was to analyze the relationship between the shape of the non-spiral scan sensitivity profile on the Z-axis (SSPz) and the shape of spiral scan SSPz and image noise of spiral pitch with an asymmetric-type detector in multi-slice CT. In the first experiment, we used a bead phantom of 0.1 mm in diameter with non-spiral SSPz and spiral SSPz. Measuring non-spiral SSPz, we moved the bead phantom by manual control and measured the effect of partitions on each slice collimation, the full width at half maximum (FWHM), and the full width at tenth maximum (FWTH). When we experienced spiral scan, we measured FWHM and FWTM at various pitches and collimations. In the subsequent experiments, we used a water phantom of 200 mm in diameter to image noise. We measured the standard deviation (SD) of the CT number at the center of the water phantom at various pitches and collimations. The results of non-spiral SSPz showed that partitions had an effect on the shape of SSPz. On the other hand, at the same collimation, the results of spiral SSPz showed that spiral pitches had no effect on FWHM. However, spiral pitches had a slight effect on FWTM and the base of SSPz. The results of image-noise showed that, if the same collimation was used, spiral pitches had little effect on SD because of tube current control. Thus our results were different from the those obtained with a matrix-type detector in multi-slice CT.

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