Dosismessungen bei Spiral-CT-Untersuchungen der Kopf-Hals-Region

Autor:	G. Teubert, Mathias Cohnen, Ulrich Mödder, K. Ewen, B. Cohnen
Rok vydání:	1998
Předmět:	medicine.medical_specialty business.industry Dose profile Imaging phantom Paranasal sinuses medicine.anatomical_structure Coronal plane medicine Dosimetry Radiology Nuclear Medicine and imaging sense organs Radiology Eyelid Head and neck Nuclear medicine business Spiral
Zdroj:	RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren. 168:474-479
ISSN:	1438-9010 1438-9029
DOI:	10.1055/s-2007-1015164
Popis:	PURPOSE In view of the increasing frequency of computed tomographic examinations the organ doses of the thyroid gland and the eye lenses in spiral CT examinations of the head and neck should be determined. MATERIAL AND METHODS Standard CT-examinations of the neck, the paranasal sinuses in axial and coronal sections, and the mandibula were simulated by help of an Alderson-Rando phantom. Dose measurements were performed as well in 28 patients. The examinations were carried out in spiral mode ("Somatom AR.SP", "Picker PQ 2000", and "Toshiba Xpress SX") and conventional single slice technique ("Somatom Plus"). Three LiF-TLD were placed on each eyelid and three on the thyroid. RESULTS With direct exposure to the x-ray-beam the organ doses did not exceed 64 mGy. When exposed by scatter radiation only, doses may be reduced by a factor of up to 10. The measurements in 28 patients showed similar results. CONCLUSIONS The organ doses in spiral CT correspond with data known from conventional CT.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e1a856d6b0f191c28bdd8d518faae10f https://doi.org/10.1055/s-2007-1015164 Zobrazit plný text záznamu