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| The relation between the increased radioactivity in the sacrum without lesion on planar bone scan and the tilt angle of the first sacral vertebra |
| LI Wei, LI Wen, ZHANG Lin-qi, ZHANG Ru-sen |
| Department of Nuclear Medicine, Affiliated Cancer Hospital & Institute Guangzhou Medical University, Guangzhou 510095, China |
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Abstract Objective: Through the comparison between planar bone scan and SPECT/CT sagittal images, to analysis the relationship between the sacral increased radioactivity without lesion on planar bone scan and the physiological position of the sacrum. Methods: A retrospective study was performed on a total of 93 cases without sacral organic lesions, who underwent whole body planar bone scan and lumbosacral SPECT/CT on the same day. These cases were divided into concentration group and non-concentration group according to the planar bone scan image. The angle between the lower edge of the first sacral vertebra and scan bed surface was measured on SPECT/CT sagittal image. Then, an analysis was performed to evaluate if there was significant difference between the two groups. Results: Ninety-three cases were divided into concentration group of 26 cases, the angle was 80.6°±3.0°, non-concentration group of 67 cases, the angle was 64.5°±5.2°. There was significant difference between the two groups(t=14.917, P=0.000). Conclusion: Excessive inclination of the lower edge of the first sacral vertebra is the real reason of the increased radioactivity in sacrum without lesion on planar bone scan.
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Received: 20 November 2017
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