Abstract：Objective To investigate the influence of carbon fibre flat plates (including a CIVCO carbon fibre CT flat tabletop and
ORFIT AIO carbon fibre immobilization base plates) on CT image uniformity. Methods The following experimental methods
including 5 kinds of water phantom position were utilized to carry out the work. A situation: the water phantom was suspended in
the air. B situation: the water phantom was placed on the CT flat tabletop. C situation: a base plate was positioned between the water
phantom and the CT flat tabletop. D situation: two base plates were positioned between the water phantom and the CT flat tabletop.
E situation: three base plates were positioned between the water phantom and the CT flat tabletop. Six radiotherapeutic scanning
protocols had been used to acquire CT images. Nine circular regions of interest (ROIs), each with area of 2.34 cm2, were selected
at the spots that were 0 cm, 5.0 cm (inner ring) and 7.5 cm (outer ring) away from the centroid at 3, 6, 9 and 12 o’clock positions to
calculate the CT mean value and image uniformity in two ROI cases. Results The CT image uniformity deteriorated when placing
the carbon fibre flat plates under the water phantom. The influence of carbon fibre flat plates on CT image uniformity was greater
for ROIs of outer ring than for those of inner ring. The influence on CT mean value of outer ring focused mainly on the bottom part
(6 o’clock direction). Conclusion Carbon fibre flat plates have influence on CT image uniformity. It should be paid attention to the
correct position of water phantom when carrying out quality control tests for CT devices.
沈恩龙a，柏正璐b，时飞跃a. 碳纤维平板对CT图像均匀性影响的研究[J]. 中国医疗设备, 2018, 33(8): 80-82.
SHEN Enlonga, BAI Zhenglub, SHI Feiyuea. Study on Influence of Carbon Fibre Flat Plates on CT Image Uniformity. China Medical Devices, 2018, 33(8): 80-82.
