《ct的質(zhì)量控制》ppt課件 (2)(文件)
【正文】 ctor mode) ? CTDIvol (scan overlap or gap, . pitch) Need to pay attention to all three! 需特別注意這三個(gè)值（ scan length ， CTDI 和 CTDIvol ）！ What‘s the dose (risk)? 劑量（風(fēng)險(xiǎn)）是多少？ ? Radiation detriment better expressed by Effective Dose (E 輻射損害的較好表達(dá)為有效劑量 ? a single dose parameter which reflects the risk of a nonuniform exposure in terms of a wholebody exposure 就整個(gè)軀體的而言，單個(gè)劑量參數(shù)反映了非均勻暴露的風(fēng)險(xiǎn) ? Published values of effective 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(guó)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。 。 optimize 知曉，理解和優(yōu)化 CTDImax , CTDIvol, DLP, and E ? Reference doses had positive effect in UK, used as part of the ACR accreditation process in the US 在英國(guó)，參考劑量具有積極的效果；在美國(guó)，它被應(yīng)用于認(rèn)證過(guò)程 ? Use effective dose to assess relative risk 應(yīng)用有效劑量評(píng)估風(fēng)險(xiǎn) Summary 總述 ? CT: large percentage of the medical collective dose to population CT: 對(duì)人群使用醫(yī)療檢查劑量的高百分比 ? Prudent response: Apply ALARA principles 審慎響應(yīng)：使用 ALARA原則 ? CT Automatic Exposure Control a long overdue product is now available on new scanners makes dose calculations more difficult. CT dose worthy of closer attention CT自動(dòng)曝光控制 —一個(gè)姍姍來(lái)遲的、應(yīng)用于新掃描儀的產(chǎn)品 —使得劑量計(jì)算更困難。T CTDIvol = CTDIw When I ? N 7 T) FDA使用定積分極限（ 177。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(guó)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(guó)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(wèn) 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(cè)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 of the scanner 由于掃描儀調(diào)節(jié)不到位，產(chǎn)生很多干擾偽影 ? Loss of resolution 分辨率下降 ? Accuracy of CT numbers CT值的精度 ? Table Location 掃描床的定位 ? CT is a high dose procedure CT診斷是一個(gè)高劑量輻射的過(guò)程 It is important to know the dose for various studies and to select appropriate dose for optimal clinical performance 重要的是了解各種研究所需的劑量，從而選擇適當(dāng)?shù)牧恳垣@得最優(yōu)的臨床表現(xiàn) Clinical Technique 臨床技術(shù) ? Once the basic dose performance of the scanner is determined, the physicist should work with physician colleagues to optimize imagequality and dose 一旦確定了掃描儀的工作劑量，物理學(xué)家就要與臨床醫(yī)師合作優(yōu)化影像質(zhì)量 ? Each site should have techniques tailored to the local needs
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