3T磁共振應(yīng)用體會(huì)課件

3T磁共振的物理特點(diǎn)3T磁共振應(yīng)用體會(huì)3T磁共振應(yīng)用體會(huì)3T磁共振的物理特點(diǎn)相對(duì)于1.5T磁共振：1、信噪比提高一倍2、化學(xué)位移分辨率提高一倍3、磁敏感效應(yīng)提高4、T1時(shí)間延長(zhǎng)5、射頻波長(zhǎng)變短6、SAR(特殊射頻吸收率)提高了四倍3T磁共振應(yīng)用體會(huì)信噪比提高一倍優(yōu)點(diǎn)：1、顯示細(xì)節(jié)能力提高2、血管成像質(zhì)量提高3、相同SNR時(shí)間減少3T磁共振應(yīng)用體會(huì)化學(xué)位移分辨率提高一倍優(yōu)點(diǎn)：1、MRS分辨率明顯提高2、壓脂效率提高缺點(diǎn)：化學(xué)位移偽影增加3T磁共振應(yīng)用體會(huì)磁敏感效應(yīng)提高優(yōu)點(diǎn)：1、SWI（磁敏感加權(quán)成像）序列更好2、T2*PWI序列更好3、BOLD（血氧水平依賴腦功能成像）序列更好缺點(diǎn)：1、對(duì)磁場(chǎng)不均勻更加敏感2、磁敏感偽影增加3、大范圍成像困難4、大范圍壓脂效果不穩(wěn)定5、對(duì)呼吸血流等運(yùn)動(dòng)偽影敏感3T磁共振應(yīng)用體會(huì)T1時(shí)間延長(zhǎng)優(yōu)點(diǎn)：1、TOF法血管對(duì)比更好2、縮短T1增強(qiáng)效果更好3、更好的ASL(動(dòng)脈自選標(biāo)記)缺點(diǎn)：1、T1W整體背景變黑2、腦部T1W用IR（翻轉(zhuǎn)回復(fù)序列）增強(qiáng)對(duì)比3T磁共振應(yīng)用體會(huì)射頻波長(zhǎng)變短缺點(diǎn)1、體部有射頻沉積偽影2、必需多源發(fā)射補(bǔ)償3T磁共振應(yīng)用體會(huì)SAR（特殊射頻吸收率）提高了四倍缺點(diǎn)：1、減少掃描范圍2、減少掃描時(shí)間（以控制SAR值）3T磁共振應(yīng)用體會(huì)鼓樓醫(yī)院檢查項(xiàng)目分類3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描

(透視跟蹤啟動(dòng)掃描)3T磁共振應(yīng)用體會(huì)高分辨率掃描

(透視跟蹤啟動(dòng)掃描)3T磁共振應(yīng)用體會(huì)高分辨率掃描

(透視跟蹤啟動(dòng)掃描)3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描3T磁共振應(yīng)用體會(huì)高分辨率掃描

+大范圍DWIBS（彌散背景抑制、類PET）3T磁共振應(yīng)用體會(huì)全身成像（病灶篩查）3T磁共振應(yīng)用體會(huì)功能成像——DWI3T磁共振應(yīng)用體會(huì)3T磁共振應(yīng)用體會(huì)功能成像——DTI3T磁共振應(yīng)用體會(huì)DTImergeBOLD3T磁共振應(yīng)用體會(huì)功能成像——PWI3T磁共振應(yīng)用體會(huì)T2*PWI3T磁共振應(yīng)用體會(huì)T1-PWI3T磁共振應(yīng)用體會(huì)功能成像——MRS3T磁共振應(yīng)用體會(huì)功能成像——VenousBOLD主要用來顯示小靜脈、微出血及鐵沉積(高分辨率的3D梯度回波序列)3T磁共振應(yīng)用體會(huì)3T磁共振應(yīng)用體會(huì)