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Objective To analyze the correlation between thoracic and lumbar bone mineral density and to identify specific diagnostic thresholds of osteoporosis and osteopenia for the thoracic spine. Methods Retrospective analysis of 276 patients who received abdomen non-contrast-enhanced CT scan for otherindication. BMD of each vertebra spanning T10–L3 was measured, the correlation between BMD of each vertebral body, mean T10-T12 BMD and mean L1-L3 BMD were analyzed using Pearson analysis. The cut-off values of thoracic spine (T10-12) averaged BMD for osteoporosis and osteopenia were calculated using linear regression. Results The BMD of vertebral body from T10 to L3 gradually decreased, with the highest BMD in the T10(120.49 ± 35.96 mg/cm3) and lowest at L3 (95.62 ± 35.95 mg/cm3). Significant correlations in BMD among all measured thoracic and lumbar levels were observed（r=0.894-0.967, P＜0.05）, and a Pearson’s correlation coefficient between mean T10-T12 BMD and mean L1-L3 BMD was 0.957. Respective cut-off values of mean T10-T12 BMD for osteoporosis and osteopenia was 96.59 mg/cm3 and 134.75 mg/cm3. Conclusion There is a high correlation between mean L1-L3 BMD and mean T10-T12 BMD, BMD measurement of thoracic spine can be used as a method for diagnosis of osteoporosis and osteopenia. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To explore the reproducibility, correlation, consistency, and clinical application value of the lumbar BMD measured with Philips workstation IntelliSpace (IP, without phantom) and Mindways (MW) QCT Pro (with phantom), respectively. Methods Two hundred and twenty patients were performed abdominal scan in clinic. The scan data were sent to the IP and MW bone mineral density measurement software for measurement. The Pearson correlation test was used to analyze the correlation between the measurement result of the two software. The paired sample t test was used to analyze whether the average values of the two method were different. The Bland-Altman chart was used to analyze the consistency of the two. Thirty randomly selected cases were measured twice by different operators using each QCT software to test the reproducibility. Results There was significant correlation between two measurements in 30 randomly selected cases using IP and MW software. Correlation coefficient was 0. 977 (P < 0. 01) showing high reproducibility. There was no significant difference between the two measurements (P > 0. 05). The BMD value measured with IP (92. 93±36. 16 mg/cm³) was significantly lower than that measured with MW (112. 78± 41. 36 mg/cm³). There was a positive correlation between the two measured values (r= 0. 911, P

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

目的 探讨自动曝光技术结合迭代重建技术对降低肝脏 CT 辐射剂量的可行性。方法 选择疑诊肝肿瘤或肝肿瘤复查患者93例,随机将其分为A、B、C 组各31例,三组均予64排螺旋 CT 扫描检查,A组电压120 k V、电流150 m As,B、C 组采用自动曝光技术并迭代重建技术对数据进行重建,B 组电压120 k V、电流130 m As,C 组电压120 k V、电流110 m As。计算三组有效辐射剂量、主观评价图像质量(分辨率、图像失真、诊断信心度)、客观评价图像质量(CT 值、噪声、SNR、CNR)。结果 A、B、C组有效辐射剂量分别为(7.64±0.67)、(4.23±0.27)、(2.41±0.38)m Sv,三组有效辐射剂量比较,P<0.05。A、B 组图像分辨率、图像失真、诊断信心评分及总分均高于C 组(P均<0.05)。B 组肝 CT 值、SNR、CNR 高于 A、C 组(P<0.05),三组噪声比较,P>0.05。结论 肝脏 CT 扫描时采用自动曝光技术结合迭代重建技术可有效降低辐射剂量,管电流降至130 m As时不影响图像质量。 [ABSTRACT FROM AUTHOR]