nguyên lý ct
TRANSCRIPT
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Nguyên lý
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1895 : W.C. Roentgen phaùt hieän tia X X quang
Lòch söû
W.C.Roentgen (1845-1923)
4/1972 Hounsfield : Giôùi thieäu maùy CT ñaàu tieân
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Sự chồng hình
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Tương phản kém
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Slice / CutSlice / Cut
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TOMOGRAPHY
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Nguyên lý tạo hình
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Nguyeân lyù taïo hình
Maùy tính
Ñaàu doø (Detectors)
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VOXELVOXEL
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PIXELPIXEL
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CT numbersCT numbers
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Hounsfield và thang xám
+ 1000
-1000
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Theá heä ITheá heä II
Theá heä III Theá heä IV
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CT: ĐA LÁT CẮT # ĐA DÃY ĐẦU DÒ
- MULTI-SLICE # DETECTORS
-Khaûo saùt ñoàng thôøi nhieàu laét caét.
-Thôøi gian queùt nhanh.
-Khaûo saùt toát trong caùc tröôøng hôïp caàn thôøi gian nhanh (tim-maïch, coù bôm caûn quang, boä phaän cöû ñoäng..).
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Ña chaán thöôngTaàm soaùt toaøn boä cô theå
Nam 28t/ Ña chaán thöôngVôõ thaân soáng L4/ xöông ñuøi (T)/ xöông goùt (P)/ UÏ ngoài
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NOÄI SOI AÛO PHEÁ QUAÛN
(Virtual bronchoscopy)
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Ñoùng voâi maïch vaønh
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Khaûo saùt tim vaø chuïp maïch vaønh
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NOÄI SOI AÛO ÑAÏI TRAØNG
(Virtual colonoscopy)
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– Xương : +1000 HU
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+400+400
+300+300
+200+200
+100+100
00
-100-100
-200-200
-300-300
-400-400
Wide Wide WindowWindow
Narrow Narrow WindowWindow
Hounsfield UnitsHounsfield Units
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W:80 L:40 W:1500 L:480 W:350 L:90
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Axial plane
Coronal plane
Saggital plane
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Axial plane Coronal plane Saggital plane