Department of Oral and Maxillofacial Radiology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Int J Oral Maxillofac Implants. 2010 Nov-Dec;25(6):1093-8.
Recently, cone beam computed tomography (CBCT) was developed and applied to presurgical imaging for dental implant treatment. Because the values obtained from CBCT images are not absolute values, unlike the Hounsfield units obtained by medical CT, the relationship between the values of trabecular bone morphometry obtained in small-volume CBCT images and CT values obtained from multislice CT was evaluated in an in vitro study.
Small-volume CBCT and multislice CT were performed in the posterior mandible. Subsequently, morphometric analysis of the trabecular bone in CBCT images was performed using three-dimensional bone morphometry software, and the correlations between the trabecular bone volume per total tissue volume (BV/TV) obtained using CBCT images and CT values generated from multislice CT images were analyzed.
BV/TV ranged from 3.1% to 42.7%, with a mean of 20.4% (SD: 11.4) when the setting was 0.5 for the threshold. The correlations between BV/TV using the threshold values ranged from 0.3 to 0.7, and CT values showed a high level of correlation (range: 0.83 to 0.93).
The trabecular BV/TV was closely correlated with CT values obtained using multislice CT images. It was suggested that the trabecular BV/TV can be used to evaluate the density of mandibular cancellous bone in dental implant treatment.
最近，锥形束 CT（CBCT）得到了发展并应用于牙科种植术前成像。由于 CBCT 图像获得的值不是绝对值，与医疗 CT 获得的亨氏单位不同，因此在一项体外研究中评估了小体积 CBCT 图像中获得的小梁骨形态计量值与多层 CT 获得的 CT 值之间的关系。
在后下颌骨进行小体积 CBCT 和多层 CT。随后，使用三维骨形态计量学软件对 CBCT 图像中的小梁骨进行形态计量分析，并分析使用 CBCT 图像获得的小梁骨体积与总组织体积之比（BV/TV）与从多层 CT 图像生成的 CT 值之间的相关性。
当阈值设置为 0.5 时，BV/TV 范围为 3.1%至 42.7%，平均值为 20.4%（SD：11.4）。使用阈值值的 BV/TV 之间的相关性范围为 0.3 至 0.7，并且 CT 值显示出高度的相关性（范围：0.83 至 0.93）。
小梁骨的 BV/TV 与使用多层 CT 图像获得的 CT 值密切相关。表明小梁骨的 BV/TV 可用于评估牙科种植治疗中下颌骨松质骨的密度。
