ESTIMATION OF ABSORBED DOSE IN OCCLUSAL RADIOGRAPHY

교합방사선사진 촬영시의 흡수선량 계측

  • Yoo Young Ah (Department of Dental Radiology College of Dentistry, Kyungpook National University) ;
  • Choi Karp Shik (Department of Dental Radiology College of Dentistry, Kyungpook National University) ;
  • Lee Sang Han (Department of Oral and Maxillofacial Surgery, College of Dentistry, Kyungpook National University)
  • 유영아 (경북대학교 치과대학 치과방사선학 교실) ;
  • 최갑식 (경북대학교 치과대학 치과방사선학 교실) ;
  • 이상한 (경북대학교 치과대학 치과방사선학 교실)
  • Published : 1990.06.01

Abstract

The purpose of this study was to estimate absorbed dose of each important anatomic site of phantom (RT-2l0 Head & Neck Section/sup R/, Humanoid Systems Co., U.S.A.) head in occlusal radiography. X-radiation dosimetry at 12 anatomic sites in maxillary anterior topography, maxillary posterior topography, mandibular anterior cross-section, mandibular posterior cross-section, mandibular anterior topographic, mandibular posterior topographic occlusal projection was performed with calcium sulfate thermoluminescent dosimeters under 70Kvp and 15mA, 1/4 second (8 inch cone) and 1 second (16 inch cone) exposure time. The results obtained were as follows: Skin surface produced highest absorbed dose ranged between 3264 mrad and 4073 mrad but there was little difference between projections. In maxillary anterior topographic occlusal radiography, eyeballs, maxillary sinuses, and pituitary gland sites produced higher absorbed doses than those of other sites. In maxillary posterior topographic occlusal radiography, exposed eyeball site and exposed maxillary sinus site produced high absorbed doses. In mandibular anterior cross-sectional occlusal radiography, all sites were produced relatively low absorbed dose except eyeball sites. In mandibular posterior cross-sectional occlusal radiography, exposed eyeball site and exposed maxillary sinus site were produced relatively higher absorbed doses than other sites. In mandibular anterior topographic occlusal radiography, maxillary sinuses, submandibular glands, and thyroid gland sites produced high absorbed doses than other sites. In mandibular posterior topographic occlusal radiography, submandibular gland site of the exposed side produced high absorbed dose than other sites and eyeball site of the opposite side produced relatively high absorbed dose.

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