A. Katsumata, K. Ogawa, K. Inukai, M. Matsuoka, T. Nagano, H. Nagaoka, et al., “Initial Evaluation of Linear and Spatially Oriented Planar Images from a New Dental Panoramic System Based on Tomosynthesis,” Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, Vol. 112, No. 3, 2011, pp. 375-382.

has been cited by the following article:

• TITLE: Removal of the Shadow of Cervical Vertebrae from Panoramic X-Ray Images with a Tomosynthesis Method

  AUTHORS: Koichi Ogawa, Jyunpei Yamamoto, Masatoshi Yanase, Akitoshi Katsumata

  KEYWORDS: Panoramic; Radiography; Cervical Vertebrae; Subtraction Technique

  JOURNAL NAME: Open Journal of Medical Imaging, Vol.3 No.4, December 20, 2013

  ABSTRACT: The purpose of this study is to remove the shadow of cervical vertebrae from dental panoramic x-ray images with a tomosynthesis method and improve the contrast of details in both the teeth and jaw bones. To measure the shift-amount at each angular position that was required for reconstruction of panoramic x-ray images of the dental arch, strip images of a calibration phantom were acquired. Then, a shift-amount table was prepared from these images, and the other shift-amount table, which was used to reconstruct a panoramic image of the cervical vertebrae, was prepared by inverting the curve of the shift-amount table upside down. Using these two tables, images focused on the dental arch and cervical vertebrae of a patient were made with the original strip data of the patient. The shadow of the cervical vertebrae appearing on the image focused on the dental arch was removed using the two above-mentioned images and blurring functions defined at two focusing geometries. The validity of the proposed method was evaluated with clinically acquired data of two patients. The shadow of the cervical vertebrae was successfully eliminated, and the contrast of the front teeth and detailed structures of the jaw bones was improved. The results of the experiments showed that our proposed method was significantly effective in removing the shadow of the cervical vertebrae from conventional panoramic x-ray images.