Design and evaluation of the optimized styloid digital tomosynthesis examination posture by three-dimensional CT reconstruction measurements(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第2期
- Page:
- 205-209
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Design and evaluation of the optimized styloid digital tomosynthesis examination posture by three-dimensional CT reconstruction measurements
- Author(s):
- WANG Shiming; LU Yunfeng; WANG Guoshu; SONG Liqiang; JIN Rui
- Department of Radiology, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
- Keywords:
- Keywords: CT three-dimensional reconstruction; styloid process; digital tomosynthesis; anteroposterior posture; lateral posture
- PACS:
- R318；R814
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.02.013
- Abstract:
- Abstract: Objective Taking the head and neck anthropomorphic phantom as the experimental object to design and evaluate the styloid digital tomosynthesis (DTS) examination posture optimized by three-dimensional CT reconstruction measurements. Methods A 128-layer spiral CT was used to scan the head and neck anthropomorphic phantom. The anterior oblique angle, internal oblique angle and length of the styloid process were measured by CT post-processing station, thereby determining the optimized anteroposterior and lateral postures for the DTS examination of the styloid process. The traditional and optimized anteroposterior and lateral scans for the DTS examination of the styloid process were performed on the same anthropomorphic phantom, and the left and right lengths of the styloid process in different postures were measured after the styloid process was reconstructed on DTS post-processing station. The CT measurements were taken as the reference values to compare and analyze the accuracy of the length measurement of the styloid process under different DTS examination postures and reconstruction methods. Results The anterior oblique angle and internal oblique angle of the styloid process measured by three-dimensional CT reconstruction technology were 21° and 24° at the left side, 22° and 28° at the right side, and the left and right lengths of the styloid process were 21.0 mm and 21.4 mm. In the optimized anteroposterior and proximal lateral reconstruction images obtained in the DTS examination of the styloid process, the left and right lengths of the styloid process were nearly equal (21.5 mm vs 22.1 mm), and their deviations from the reference value were less than 1 mm and the deviation degrees were less than 5%, which met the clinical requirements. The measurements were more accurate than the data acquired in the traditional postures which had 19.0 mm (left) and 19.3 mm (right) in the traditional anteroposterior reconstruction images, 19.2 mm (left) and 22.6 mm (right) in the traditional proximal lateral reconstruction images, and 18.5 mm (left) and 18 mm (right) in the traditional distal lateral reconstruction images. However, the deviation value (8.8 mm at the left side and 4.4 mm at the right side) and deviation degree (41.9% and 20.6% at the two sides) of the measurements of the distal styloid process lengths in optimized lateral posture were much larger, which did not meet the clinical requirements. Conclusion The optimized styloid DTS examination postures designed by three-dimensional CT reconstruction measurements have high application value. The measurement of styloid length in DTS examination should be carried out on the optimized anteroposterior and proximal lateral images, and the distal lateral images can not be used in the measurement of styloid length.
Last Update: 2020-03-03