Department of Applied Informatics, Faculty of Science and Engineering, Hosei University, 3-7-2 Kajinocho, Koganei, Tokyo 184-8584, Japan.
Dentomaxillofac Radiol. 2010 Jan;39(1):47-53. doi: 10.1259/dmfr/12999660.
The objective of this study was to develop a new practical method to reconstruct a high-quality panoramic image in which radiographers would be free from the onerous task of correctly locating the patient's jaws within the image layer of the panoramic unit. In addition, dentists would be able to freely select any panoramic plane to be reconstructed after the acquisition of the raw scan data. A high-speed data acquisition device was used with a CdTe (cadmium telluride) semiconductor detector and a sophisticated digital signal-processing technique based on tomosynthesis was developed. The system processes many vertical strip images acquired with the detector and generates a high-resolution and high-contrast image. To apply the tomosynthesis technique to the acquired strip images correctly, the actual movement of the panoramic unit was measured, including the X-ray tube and detector, in a scan using a calibration phantom and the authors generated a shift amount table needed for the shift-and-add tomosynthesis operation. The results of the experiments with a PanoACT-1000 panoramic unit, which was a PC-1000 panoramic unit fitted with a high frame rate semiconductor detector SCAN-300FPC, demonstrated the capability of a tomosynthesis technique which, when applied to the strip images of a dry skull phantom, could change the location and inclination of an imaging plane. This system allowed the extraction of an optimum-quality panoramic image regardless of irregularities in patient positioning. Moreover, the authors could freely reconstruct a fine image of an arbitrary plane with different parameters from those used in the original data acquisition to study fine anatomical details in specific locations.
本研究的目的是开发一种新的实用方法，以重建高质量的全景图像，使放射线技师能够从正确定位患者颌骨在全景单元图像层中的艰巨任务中解脱出来。此外，牙医可以在获取原始扫描数据后自由选择要重建的任何全景平面。该系统使用高速数据采集设备和 CdTe（碲化镉）半导体探测器，并开发了基于断层合成的复杂数字信号处理技术。该系统处理探测器采集的许多垂直条带图像，并生成高分辨率和高对比度的图像。为了正确地将断层合成技术应用于采集的条带图像，作者在使用校准体模的扫描中测量了实际的全景单元运动，包括 X 射线管和探测器，并生成了用于移位和添加断层合成操作的移位量表。使用配备高帧率半导体探测器 SCAN-300FPC 的 PC-1000 全景单元 PanoACT-1000 进行的实验结果表明，断层合成技术具有改变成像平面位置和倾斜度的能力，当应用于干颅骨体模的条带图像时。该系统允许提取无论患者定位不规则如何都具有最佳质量的全景图像。此外，作者可以自由地从原始数据采集使用的不同参数重建任意平面的精细图像，以研究特定位置的精细解剖细节。
