《Philips_CT_CTA掃描技術(shù)【技術(shù)專攻】》由會(huì)員分享,可在線閱讀,更多相關(guān)《Philips_CT_CTA掃描技術(shù)【技術(shù)專攻】(35頁(yè)珍藏版)》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。
1、CT ApplicationsDec 11,2010CTA 掃描質(zhì)量控制及注意事項(xiàng)掃描質(zhì)量控制及注意事項(xiàng)1專業(yè)課CT Applications,July 4,2010Company Confidential影響影響CTA 掃描圖像質(zhì)量的因素掃描圖像質(zhì)量的因素 掃描前準(zhǔn)備 掃描啟動(dòng)時(shí)間選擇 掃描時(shí)長(zhǎng)與循環(huán)時(shí)間的匹配 造影劑總量控制和注射速率匹配 造影劑入路選擇2CT Applications,July 4,2010Company Confidential 當(dāng)我們?cè)僬務(wù)撟⑸鋮?shù)時(shí),存在一點(diǎn)爭(zhēng)議:在CTA掃描時(shí),選擇右側(cè)肘靜脈還是左側(cè)肘靜脈,尤其是頸動(dòng)脈及肺動(dòng)脈CTA 建議從右側(cè)肘靜脈注射,因?yàn)槿绻?/p>
2、從左側(cè)肘靜脈注射,由于左側(cè)無(wú)名靜脈從三根毛血管前經(jīng)過,會(huì)有造影劑濃度過高偽影.造影劑入路選擇造影劑入路選擇影響影響CTA 掃描圖像質(zhì)量的因素掃描圖像質(zhì)量的因素3CT Applications,July 4,2010Company Confidential介紹 肺動(dòng)脈肺動(dòng)脈 CTA 常見的協(xié)議參數(shù) 注射參數(shù) 病例 頭頸部頭頸部 CTA 常見協(xié)議參數(shù) 注射參數(shù) 病例 腹部,腎臟,下肢腹部,腎臟,下肢 CTA 常見協(xié)議參數(shù) 注射參數(shù) 病例4CT Applications,July 4,2010Company Confidential肺動(dòng)脈肺動(dòng)脈 CTA掃描掃描 常見的掃描協(xié)議參數(shù) 注射參數(shù) 病例圖像
3、展示5CT Applications,July 4,2010Company Confidential肺動(dòng)脈肺動(dòng)脈CTA掃描掃描肺動(dòng)脈肺動(dòng)脈CTA掃描參數(shù)掃描參數(shù)61664iCThelicalhelicalhelicalhelicalCollimation6x1.516x1.564xo.625128x0.625Pitch0.9000.9380.9380.938Thickness0.90.90.90.9Increment0.450.450.450.45Kv120120120120Mas250250250250ResolutionstandardstandardstandardstandardRot
4、ation time0.750.50.50.5FilterBBBBthreshold100-150100-150100-150100-1506CT Applications,July 4,2010Company Confidential 肺動(dòng)脈肺動(dòng)脈CTA注射參數(shù)注射參數(shù)傳統(tǒng)的注射參數(shù)傳統(tǒng)的注射參數(shù) 80-100ml 造影劑 部分病例也可以通過具體的計(jì)算公式給出造影劑總量 350-370 mg/ml 造影劑可以得到最好的圖像威斯派克 320 也可以使用,并能得到好的圖像 肘前靜脈注射是首選的最佳注射位置 4.0 5.0ml/sec 的注射速率 有些醫(yī)院曾經(jīng)對(duì)體格較大的患者使用5.0 6.0ml
5、/sec 注射 雙筒注射器注射效果很好肺動(dòng)脈肺動(dòng)脈CTA掃描掃描7CT Applications,July 4,2010Company Confidential傳統(tǒng)肺動(dòng)脈CTA檢查監(jiān)測(cè)點(diǎn)放置8CT Applications,July 4,2010Company Confidential肺動(dòng)脈栓塞病例造影劑用量較多,靜脈干擾明顯9CT Applications,July 4,2010Company Confidential Philips常用的肺動(dòng)脈注射參數(shù)常用的肺動(dòng)脈注射參數(shù) 建議使用雙筒注射器 選擇高濃度造影劑(Isovue 370,Omnipaque 350)20-30ml 造影劑,30m
6、l生理鹽水 4.0-5.0ml/sec 右肘前臂靜脈注射 造影劑跟蹤:ROI感興趣區(qū)設(shè)置在頭臂靜脈或上腔靜脈 100-150 閾值肺動(dòng)脈肺動(dòng)脈CTA掃描掃描10CT Applications,July 4,2010Company ConfidentialPhilips目前常用肺動(dòng)脈CTA掃描方案監(jiān)測(cè)點(diǎn)放置11CT Applications,July 4,2010Company Confidential肺動(dòng)脈圖像純肺動(dòng)脈影像,無(wú)肺靜脈偽影干擾純肺動(dòng)脈影像,無(wú)肺靜脈偽影干擾12CT Applications,July 4,2010Company Confidential肺動(dòng)脈肺動(dòng)脈 CTA掃描掃描
7、 肺動(dòng)脈掃描常見失敗原因解析肺動(dòng)脈掃描常見失敗原因解析?不正確的掃描參數(shù)協(xié)議 不正確的注射參數(shù)協(xié)議 掃描時(shí)間(定時(shí)掃描 vs.造影劑跟蹤掃描 vs.峰值測(cè)試掃描)注射速率 不正確的靜脈注射位置 不正確的呼吸技術(shù) 氣短患者 患者沒有按照指示憋氣 患者的體格 較高的注射速度(許多解決方案的其中一種)極低的心輸出量 非常遺憾 13CT Applications,July 4,2010Company Confidential頭頸部頭頸部CTA掃描掃描 常見的掃描協(xié)議參數(shù) 注射參數(shù) 圖像展示14CT Applications,July 4,2010Company Confidential頭頸部頭頸部CT
8、A掃描掃描61664iCThelicalhelicalhelicalhelicalCollimation6x0.7516x0.7564xo.625128x0.625Pitch0.9000.9380.9380.938Thickness0.90.90.90.9Increment0.450.450.450.45Kv120120120120Mas250250250250ResolutionstandardstandardstandardstandardRotation time0.750.50.50.5FilterBBBBthreshold100-150100-150100-150100-150頭顱頭
9、顱 CTA 掃描參數(shù)掃描參數(shù)15CT Applications,July 4,2010Company Confidential頭頸部頭頸部CTA掃描掃描頸部頸部 CTA 掃描參數(shù)掃描參數(shù)61664iCThelicalhelicalhelicalhelicalCollimation6x1.516x1.564xo.625128x0.625Pitch0.9000.9380.9380.938Thickness0.90.90.90.9Increment0.450.450.450.45Kv120120120120Mas250250250250Resolutionstandardstandardstanda
10、rdstandardRotation time0.750.50.50.5FilterBBBBthreshold100-150100-150100-150100-15016CT Applications,July 4,2010Company Confidential頭頸部頭頸部CTA掃描掃描 選擇高濃度造影劑(Isovue 370,Omnipaque 350)藥量:iCT及64排CT:40-50ml 16排CT:90ml造影劑 注射速率:4-5ml/sec 右肘前臂靜脈注射 ROI感興趣區(qū)設(shè)置在主動(dòng)脈弓下降主動(dòng)脈一側(cè) 100-150 閾值 自動(dòng)最短延遲時(shí)間頭頸部頭頸部CTA 注射參數(shù)注射參數(shù)17
11、CT Applications,July 4,2010Company Confidential頭頸部頭頸部CTA掃描掃描頭頸部頭頸部CTA圖像圖像18CT Applications,July 4,2010Company Confidential體部體部CTA掃描掃描 常見的掃描協(xié)議參數(shù) 注射參數(shù) 圖像展示19CT Applications,July 4,2010Company Confidential如何成功得到腹部動(dòng)脈和下肢動(dòng)脈優(yōu)秀圖像 使用最佳的掃描參數(shù) 在腹部CTA掃描中,使用足夠的掃描技術(shù)充分顯示所有動(dòng)脈血管是非常關(guān)鍵的.下肢動(dòng)脈CTA掃描中,記住得讓CT掃描慢下來,防止速度過快,導(dǎo)致
12、下肢動(dòng)脈內(nèi)造影劑未顯影.正確的注射技術(shù) 使用高濃度造影劑(Isovue 370,Omnipaque 350)能增加成功率.造影劑跟蹤閾值設(shè)定在150HU 能夠工作地更好.可以修改延遲時(shí)間以進(jìn)一步提高成功率.便捷的后處理工作流程20CT Applications,July 4,2010Company Confidential主動(dòng)脈主動(dòng)脈CTA 掃描參數(shù)掃描參數(shù)61664iCThelicalhelicalhelicalhelicalCollimation6x1.516x1.564xo.625128x0.625Pitch0.9000.9380.9380.938Thickness0.90.90.90.
13、9Increment0.450.450.450.45Kv120120120120Mas250300250250ResolutionstandardstandardstandardstandardRotation time0.750.750.50.5FilterBBBBthreshold15015015015021CT Applications,July 4,2010Company Confidential主動(dòng)脈CTA血管造影 全主動(dòng)脈及胸主動(dòng)脈掃描:ROI感興區(qū)設(shè)定在降主動(dòng)脈上 腹主動(dòng)脈掃描:ROI感興區(qū)設(shè)定在腹主動(dòng)脈上.22CT Applications,July 4,2010Company
14、 Confidential腎動(dòng)脈腎動(dòng)脈CTA掃描參數(shù)掃描參數(shù)61664iCThelicalhelicalhelicalhelicalCollimation6x0.7516x0.7564xo.625128x0.625Pitch0.9000.9380.9380.938Thickness0.90.90.90.9Increment0.450.450.450.45Kv120120120120Mas250300250250ResolutionstandardStandardstandardstandardRotation time0.750.750.50.5FilterBBBBthreshold15015
15、015015023CT Applications,July 4,2010Company Confidential腎動(dòng)脈CTA血管造影 注意事項(xiàng):腎動(dòng)脈CTA掃描必須憋氣,否則會(huì)出現(xiàn)呼吸偉影,影響圖像質(zhì)量 ROI感興趣區(qū)設(shè)定在腎動(dòng)脈水平處.24CT Applications,July 4,2010Company Confidential下肢動(dòng)脈下肢動(dòng)脈 CTA 掃描參數(shù)掃描參數(shù)61664iCThelicalhelicalhelicalhelicalCollimation6x1.516x1.564xo.62564x0.625Pitch0.9000.9380.760.76Thickness2211I
16、ncrement110.70.7Kv120120120120Mas180180250250ResolutionstandardstandardstandardstandardRotation time0.750.750.750.75FilterBBBBthreshold15015015015025CT Applications,July 4,2010Company Confidential體部體部CTA檢查的注射參數(shù)檢查的注射參數(shù) 高濃度造影劑(首選350 mgI/100ml或370 mgI/100ml造影劑)造影劑量:16排:主動(dòng)脈,上、下肢動(dòng)脈:90-100ml 64排:主動(dòng)脈70ml,上
17、、下肢動(dòng)脈90-100ml iCT:主動(dòng)脈50-60ml,上、下肢90ml 注射速度:主動(dòng)脈、腎動(dòng)脈4-5ml/s,上、下肢動(dòng)脈4ml/s 閾值:150HU 啟動(dòng)時(shí)間:主動(dòng)脈、腎動(dòng)脈選擇自動(dòng)最短延時(shí) 上肢到達(dá)閾值后延時(shí)8s掃描,下肢到達(dá)閾值后延 時(shí)12-15s啟動(dòng)掃描26CT Applications,July 4,2010Company Confidential下肢動(dòng)脈CTA血管解剖Superficial FemoralPopliteal ArteryAnterior TibialPeroneal ArteryPosterior Tibial27CT Applications,July 4,
18、2010Company Confidential主動(dòng)脈,腎動(dòng)脈和下肢動(dòng)脈血管圖像28CT Applications,July 4,2010Company Confidential主動(dòng)脈,腎動(dòng)脈和下肢動(dòng)脈血管圖像29CT Applications,July 4,2010Company Confidential30CT Applications,July 4,2010Company Confidential31CT Applications,July 4,2010Company Confidential下肢CTV直接法:造影劑稀釋:造影劑:生理鹽水=1:5-6 足背靜脈注射 稀釋后造影劑總量80ml 注射速率1.5-2.0ml/s 使用Blous tracking,監(jiān)測(cè)點(diǎn)至于下 腔靜脈,閾值150 32CT Applications,July 4,2010Company Confidential間接法:手臂靜脈注射 高濃度造影劑 總量:150ml 注射速率:3.0ml/s 延遲時(shí)間:150s 掃描方向:足側(cè)-頭側(cè)33CT Applications,July 4,2010Company Confidential門靜脈CTV:造影劑總量:100-150ml,延遲時(shí)間45-50s下腔靜脈CTV:造影劑總量:120-150ml,延遲時(shí)間65-75s3435