ct的質(zhì)量控制ppt課件(2)-文庫吧資料
2025-01-25 02:00本頁面
【正文】 e dose per DLP provides a quick estimate of effective dose 已出版的每 DLP的有效劑量值提供了一個(gè)快速估算途徑 ICRP 60 Weighting Values 國際輻射防護(hù)委員會(huì)的 60加權(quán)值 Gonads RBM, colon, lung, stomach Bladder, breast, liver Esophagus, thyroid Skin, bone surface Remainder ? Typical effective dose values 典型的有效劑量 Head CT 頭 CT 1 2 mSv (100 200 mrem) Chest CT 胸 CT 5 7 mSv (500 700 mrem) Abdomen CT 腹部 CT 5 7 mSv (500 700 mrem) Pelvis CT 骨盆 CT 3 4 mSv (300 400 mrem) Abdomen amp。T CTDIvol = CTDIw When I ? N end of scan volume 高估了病人在掃描開始和結(jié)束時(shí)的劑量 ? Measured directly with TLD amp。 7 T) FDA使用定積分極限（ 177。 Film Printing 監(jiān)視器顯示和底片打印 ? Monitor should be adjusted to have a proper gray scale 監(jiān)視器應(yīng)進(jìn)行調(diào)節(jié)，以便獲得適當(dāng)?shù)幕叶? ? Printed films should match monitor display 底片的打印應(yīng)與監(jiān)視器顯示狀態(tài)相匹配 ? Printers and monitors must function in DICOM format 打印機(jī)和監(jiān)視器應(yīng)在 DICOM格式狀態(tài)下工作 ? SMPTE Test Pattern used for image quality evaluation of both monitors and printers 對于打印機(jī)和監(jiān)視器，應(yīng)用 SMPTE圖形進(jìn)行影像質(zhì)量的監(jiān)測 SMPTE Test Pattern Accuracy of Table Location 掃描床的定位精度 ? Accuracy of Positioning Lights and Table Motion should be within + 2 mm 定位光與掃描床位移之間的精度應(yīng)在 + 2 mm之內(nèi) ? Return of table to the same location is especially important for interventional studies 掃描床的歸位對于干涉分析特別重要 Protocol for Table Localization 掃描床定位步驟 ? Set slice width to thinnest available 將層厚設(shè)至最小值 ? Position radioopaque wire on table and align with positioning lights 將線定位于掃描床并與定位光對齊 ? Scan – wire should appear in image 掃描 —線應(yīng)出現(xiàn)在影像中 ? Move table out to extreme and reposition to same location using numerical indicators 將掃描床移出頂端，使用數(shù)字指示重新將它定位 ? Scan – wire should appear in image 掃描 —線應(yīng)出現(xiàn)在影像中 Frequency of Testing 測試頻度 ? Test frequency is not as well defined as for some other imaging methods 測試頻度與其它的影像測試方法定義不同 ? Physicist should determine test frequency based on 其定義基于 ? Manufacturers remendations 制造商的建議 ? Experience with scanner 對掃描儀的工作經(jīng)驗(yàn) Frequency Testing Remendations 測試頻度建議 ? Dose Evaluation 劑量評估 ? Annually 每年 ? Following major service 大修后 ? Clinical Technique Evaluation 臨床技術(shù)評估 ? Annually 每年 ? When a new technique is developed 開發(fā)新技術(shù)時(shí) ? Water Evaluation 水測試 ? Weekly 每周 Frequency Testing Remendations 測試頻度建議 ? Monitor amp。Quality Control for Computed Tomography (CT), CT, 的質(zhì)量控制 Melissa C. Martin, ., DABR Certified Medical Physicist Fellow ACR, ACMP, AAPM NIM China Meeting June 13, 2022 Qualifications and Professional Activities 專業(yè)資質(zhì)和業(yè)務(wù)活動(dòng) American College of Radiology 美國放射學(xué)會(huì) Commission on Medical Physics 醫(yī)學(xué)物理學(xué)委員會(huì) Chair of Government Relations Committee 政府關(guān)系委員會(huì)主席 Mammography Accreditation Committee 乳腺 X線照相術(shù)認(rèn)證委員會(huì) Image Quality Committee for Digital Imaging 數(shù)字影像質(zhì)量委員會(huì) American Association of Physicists in Medicine (AAPM) 美國醫(yī)學(xué)物理學(xué)家協(xié)會(huì) Liaison (Advisor) to the Conference of Radiation Control Program Directors 輻射控制計(jì)劃理事會(huì)大會(huì)顧問 CT Dose and Image Quality CT輻射劑量和影像質(zhì)量 Quality Control and Quality Assurance Procedures and Issues 質(zhì)量控制和質(zhì)量保證步驟 CT and MRI imaging modalities were named as the most important medical advances in the last half of the 20th century CT和 MRI被認(rèn)為是人類二十世紀(jì)下半葉最重要的進(jìn)展 Developments in CT Technology CT技術(shù)的發(fā)展 Early CT detectors and scanner 早期的 CT檢測和掃描裝置 Modern MultiSlice CT Scanner 現(xiàn)代多層 CT掃描儀 Early CT Image (Siemens) 早期的 CT影像 MultiSlice CT Images (2022) 多層 CT影像 Quality Assurance 質(zhì)量保證 ? There are a variety of artifacts than can occur because of poor adjustment
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