Establishment of quality criteria for computed tomography in dentistry

本研究的目的是建立牙科计算机断层扫描的质量标准，以促进患者放射防护的优化。质量标准分为以下三个部分，通常是CT程序的特征：图像标准，诊断参考水平（DRL）和良好成像技术的例子。为了评价DRL，对患者进行了调查，并对牙种植中的剂量长度乘积（DLP）进行了测量。此外，作为QA/QC工具，测量了新的光激励发光CT剂量计的特性，并研究了由CT估算患者有效剂量的ImpactDose程序。种植牙CT影像学诊断标准：<Upper jaw>1. *1）颧骨突，2）腭大肌管，3）上颌结节，4）蝶骨翼突，5）翼腭窝，6）骨小梁细节的可视化2。*2 1）上颌窦底，2）上颌窦前壁，3）上颌窦后壁，4）上颌窦侧壁，5）上颌窦骨隔，6）鼻腔底，7）切牙管，8）犬齿窝，9）颧骨颞突，10）上颌骨轮廓，11）皮质骨厚度; 12）拔牙后<Lower jaw>1. *11）下颌骨下缘的可视化，2）下颌下窝，3）舌下窝，4）下颌管的切分支，5）舌孔2。*21）颏孔、2）下颌管、3）下颌骨轮廓、4）骨小梁细节、5）皮质骨厚度、6）拔牙后的清晰视觉再现 *1：可视化-在研究体积中可检测到器官和结构。* 2：清晰再现解剖细节。

he objectives of this research were to establish quality criteria for computed tomography in dentistry in order to promote optimization of radiological protection for patients. The quality criteria are divided into following three parts that are generally characteristic for the CT procedures : image criteria, diagnostic reference level (DRL) and example of good imaging technique. For evaluation of DRLs, survey of patient and measurements of dose-length products (DLPs) in dental implantation were studied. In addition, to use as QA/QC tool, characters of new optically stimulate luminescence CT dosimeter were measured and the ImpactDose program for estimating patient effective doses from CT were studied. The image criteria in CT for dental implantation were established as :<Upper jaw>1. Visualization of*1)zygomatic process, 2) grater palatine canal, 3) maxillary tuberosity, 4) pterygoid process of sphenoid bone, 5) pterygopalatine fossa, 6) details of bone trabecula2. Visually sharp reproduction of*2 1) floors of maxillary sinus, 2) anterior wall of maxillary sinus, 3) posterior wall of maxillary sinus, 4) lateral wall in maxillary sinus, 5) bony septum of maxillary sinus, 6) floors of nasal cavity, 7) incisive canal, 8) canine fossa, 9) temporal process of zygomatic bone, 10) contours of maxillary bone, 11) thickness of cortical bone, 12) postextraction<Lower jaw>1. Visualization of*11) inferior border of mandibular, 2) submandibular fossa, 3) sublingual fossa, 4) incisive branch of mandibular canal, 5) lingual foramen2. Visually sharp reproduction of*21) mental foramen, 2) mandibular canal, 3) contours of mandibular bone, 4) details of trabecular bone, 5) thickness of cortical bone, 6) postextraction*1 : Visualization of - The organs and structures are detectable in the volume of investigation.*2 : visually sharp reproduction of-anatomical details are clearly defined.