CTCT CTXCT1.0mm1.0mm0.5mm0.5mm0.25mm0.25mm25625651251210241024spatial resolution

CTreconstructionrefomationCTdensity resolutionX0.5%

CTCTCTCTXHounsfieldXCTHu Hounsfield unitCT0 Hu,CT +1000 HuCT 1000 HuCT 1000 +1000 Hu2000

CTCTCTCTCTXCT

window widthCT16CTwindow levelCT2000CT200016200016CT2000/16=125 HuCT125 HuCT

CTCTCTCT100 Hu0 HuCT50 Hu40 HuCT -10 +90 Hu

CTCTCTCTCTCT

CT CT

CTCTXX

CTCTXXCTXmAsmACT4X

1partial volume effect 2CTCTCTCTCT

2peripheral space phenomenon 2CTCTX

CT1 CT

2

3 CT

CTCT

CT

510mm510mm0120140kV70260mA60.5s256256CTCTCTCT

5mmCTCT1mm

overlap scan10mm5mm5mmCTX

target scan15mmCT

CThigh resolution CT;HRCTCTCT10Lp/cm0.5mm512512120140kV120220mA12mm

HRCT

stack sliceCTCTmAs13mm450mAs35CTCT

CTquantitative CT;QCTXCTCT80kV810mm123123

CTCTCTXCT

volumetric scanCTCTCT

1011500mosmol/kg600mosmol/kg48500700mosmol/kg300mosmol/kg

CT24ml/s50100ml100180ml50ml

CT10s352s2.53s10sCT

352312cm35mm35341260s2min3 min4 min5 min7 min9 min12 min15 min

delayed contrast seanning46hCT150180ml

CT24ml/s80100ml

CT

CTCTCTCTCTCTCT

CT 1CT 3060minCT60minCT 2CT 14hCT CT

CT CTCT () CT CT24h

CTCTCTCTX0.5cmCT

CTCTcomputed tomographic arteriographyCT-ACT2ml/s5sCTCTCT5070mlCT2040mlCTCT

CTCTcomputed tomographic arterial portographyCTAPCT-A2025sCT150170mLCT100120mLCTAP

CTCTCTX360X

CT80140kV ,50450 mA100s110mmpitch 360X1.0

CTX600mm30s10mm2.0mm30s10mm1.0300mm

CTCTCTCT 120kV3050mA110 mm512512100sCTCTCTCTCTXX

CTCTCTCTCT

CTCTmulti slice CT; MSCTCTX

1 MSCT81634816/2 MSCT0.5s/3X MSCTX7.5mHu1386kHu/min

4X X5 MSCT0.5mm/1310.5s1mmXX

6 MSCT

MSCTCTCT1 MSCTX0.5s80ms

2 MSCTCTXXX3 MSCTCT4X5

MSCTCTMSCT

CTCT CT

multiplane refomationMPR65mmCTMPRCT

CTvolume refomation;VR

1maxium intensity projection; MIP CTMIPMIP2 MIP

surface shaded display;SSDCTCTCTSSDSSDCTCTCTACTCT

CT CTCT virtual endoscopyCTVECTCTVECT100%0Z

CTVECTVECTVE

CT CTCT angiography; CTACTMIPSSDMIPSSD

CTAMRACTADSACTACTCTA

CTCTCT perfusion imagingCT