研究生: |
林源山 Yuan-Shan Lin |
---|---|
論文名稱: |
核子醫學之線上體內劑量評估 On-line Assessment of Internal Dose in Nuclear Medicine |
指導教授: |
董傳中
Chuan-Jong Tung |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 生醫工程與環境科學系 Department of Biomedical Engineering and Environmental Sciences |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 82 |
中文關鍵詞: | 核子醫學 、體內劑量 、線上評估 、熱發光劑量計 、胸腺 、脾臟 |
外文關鍵詞: | nuclear medicine, internal dosimetry, On-line Assessment, thermoluminescent dosimetor( TLD), thymus, spleen |
相關次數: | 點閱:3 下載:0 |
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摘要
體內劑量係指人體組織器官內之放射性物質所造成的輻射劑量,包括吸收劑量、等價劑量、約定劑量、有效劑量等。體內劑量的應用範圍,包括輻射防護及核子醫學。核子醫學關切的是經由注射或吞服進入體內之核醫藥物。核子醫學之放射性藥物的半衰期雖然都很短,而且其進入體內時之活度、物理形態、化學形態等均係已知,但因個別病患之新陳代謝數據的差異仍大,因此評估體內劑量也不甚容易。
本論文主要研究在核子醫學上的體內劑量評估。利用台北榮總核醫部Siemens ECAM+造影機中安裝的軟體NucliDose,並針對自行製作之MIRD假體及臨床核醫檢查影像,線上評估符合MIRD模式之人體器官所受的輻射劑量。本研究另外也使用熱發光劑量計實際度量體內劑量,並與NucliDose評估之結果比較。
修正過後,NucliDose的計算結果皆大於TLD的量測結果。靶器官部分,二者的吸收劑量結果,經過修正後非常的相近。源器官部分,NucliDose高估了約3倍的吸收劑量,但二者的結果尚在同一個階層中(in the order of magnitude)。
體內劑量評估最大的困難在於不同個體之間的差異性,而使用NucliDose搭配影像系統,可藉由影像資料分析進一步探討個體間的變化,是解決此難題之一大利器,且本實驗建立了一套體內劑量評估之流程與方法,可供進行相關實驗之專業人員參考之用。
Abstract
Internal dose, including absorbed dose, equivalent dose, committed dose and effective dose, is the results of radionuclides in the body. The application of internal dose covers two main areas, namely radiation protection and nuclear medicine. In nuclear medicine, radioactive pharmaceuticals enter the body through injection and oral intake. Internal dosimetry is an uneasy task in nuclear medicine due to the variation of biokinetics in individual patients despite of the short half-life of radiopharmaceuticals and known physical and chemical characteristics.
The present study is to establish a model of medical internal dosimetry by the MIRD (Medical Internal Radiation Dosimetry) calculation techniques and provide the standard reference for quality assurance of medical radiation dosimetry. This study was applied to the Siemens ECAM+ dual head gamma camera using NucliDose on-line assessment program. NucliDose has been installed to estimate the absorbed dose in the nuclear medicine imaging. Further, thermoluminescent dosimeters (TLDs) have been used to measure the absorbed doses to nuclear medicine patients (phantoms). Results of NucliDose on-line assessment and TLD measurement are compared to each other.
After corrections, the estimated results of NucliDose are larger than the measured results of TLD. In the target organ, two results are very close. On the other hand, in the source organ, NucliDose is about 3 times larger than TLD, but this two results are in the order of magnitude.
The most difficult reason to assess the internal dosimetry is the differences between people. NucliDose collocated with nuclear imaging system is a powerful tool for us to know how the differences are. And during the study, we establish a procedure to assess the internal dosimetry. This procedure is able to provide the professional to do their future study.
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