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| Experimental Study on the Backscatter Properties of Various Phantoms Used in Medical X-ray Diagnostic Dosimetry and QA |
| ZHU Zhi-xian1, TANG Wen-xiang1, HAN Fa-ming1, et al |
| Shenzhen Hygiene & Antiepidemics Station, shenzhen 518020, China |
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Abstract Objective To determine the approximation of backscatter property of human body by stimulation phantoms commonly used in medical diagnostic X-ray dosimetry.Methods To measure and compare the backscatter factors of various kinds of phantom and human body under the identical projection conditions.Results In the lower energy region,the backscatter property of PMMA is close to that of human body,and in the higher energy region the backscatter property of water is close to that of human body.For the general X ray examinations on chest and abdomen.The dose due to the backscatter rays is about 40% of the dose of the primary rays.Conclusion A standardized phantom used in QC in radiography is a commitment phantom,for which the purpose is to harmonize the method and to make easy to compare the measurement data.
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Received: 22 May 2001
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