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Tomografia komputerowa B. Augustyniak. Tomografia komputerowa – CT 3D.

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Presentation on theme: "Tomografia komputerowa B. Augustyniak. Tomografia komputerowa – CT 3D."— Presentation transcript:

1 Tomografia komputerowa B. Augustyniak

2 Tomografia komputerowa – CT 3D

3 CT - 3D

4 CT - aparatura Siemens Somatom Plus 4 Power / Expert Siemens Somatom AR.xx

5 Detektory X (1) The replacement of the medical radiographic film has been the main driver, during the last decade for large area X-ray detectors development Several Flat Panel X-Ray detectors (FXD) are now available, all of them using Amorphous Silicon Technology, for digital radiography system FXD for dynamic imaging ( 30 fps) of the heart have been recently introduced

6 Detektory X (2) – wymagania

7 Detektory X (3) budowa - X-Ray converter : scintillator or photoconductor - Active aSi:H readout matrix - External readout Amplifiers/multiplexers and lines drivers

8 Detektory X (4) budowa Two designs are currently used

9 Detektory X (5) budowa Thallium doped Cesium Iodine (CsI) screen - Vapour grown - Tl doped for green emission - Columnar structure - Large area 43cm x 43 cm - Thickness ~ µm - X-ray Absorption : 80 % at 60keV

10 CT – zasada rejestracji i rekonstrukcji

11 CT - tworzenie obrazu 3D

12 Obrazy CT 2D - głowa ACUTE EPIDURAL HEMATOMA Subdural Hematoma, Acute on ChronicSubdural Hematoma, Acute on Chronic


14 Obrazy CT 2D - środek TYPE A AORTIC DISSECTION The areas marked T demonstrate flow within the true lumen of a aortic dissection which involves both the ascending as well as descending portions of the arch on this examination. The areas marked F correspond to the false lumen

15 Obrazy CT 2D - środek (2) The axial CT scan examination of the lower chest done without the use of intravenous contrast shows a loculated left pleural effusion with air demonstrated within its confines which indicate an infected pleural space or the presence of a bronchopleural fistula. The arrow points to an area where there is communication between the pleural effusion and the extrapleural space, notably in this case the musculature of the lateral chest wall. This is radiologically compatible with a fistula communication between the possibly infected pleural fluid and the extrapleural space and represents an empyema neccesitans ctscan/Ct.asp

16 Najnowsze osiągnięcia CT 1) mikro – CT 2) kolorowanie obrazu CT



19 Mikro-CT The Micro CT technique can be for a wide variety of samples producing detailed structural images of objects as diverse as bone, composite fibers, electronic components, seeds, diamonds and wood. The instrumentation comprises a finely focused sealed X-ray tube, a precision sample manipulator, an X-ray CCD camera and a Dual Pentium workstation with tomography software running under WindowsXP. There are four versions of the 1172 Micro CT instrumentation depending on your choice of energy level (80Kv or 100 Kv and camera resolution (10 Mega-pixel or 1.3 Mega-pixel)

20 Mikro-CT -aparatura

21 Mikro-CT -aparatura

22 Mikro-CT Two 130 kV ultra-high resolution microfocus x-ray systems (with integrated high voltage power supply and controller) Focal spot size as low as 7 microns Two 100/50 mm dual-field image intensifiers Two 1600 x 1200 x 30 frames/sec CCD cameras Dual Xeon ® workstation with high capacity disk array Precision rotating gantry and a precision specimen positioner Computer-configurable source-to-image distance geometries High-speed data and power slip ring for continuous rotation

23 Smallest detail detectability 10 Mpixel Camera ~ 1um 1.3 Mpixel Camera ~2um X-ray sourcesealed microfocus X-ray tube, air cooled, >10000h lifetime spot 20-80kV, 0-100uA spot size X ray detector 10 Megapixel (4000x2300) 12-bit digital cooled CCD with fibre optic coupling to scintillator (50mm field of view) Maximum object size for reconstruction 35mm in diameter for standard scan, 68mm in diameter for scan with camera offset (twice longer) Reconstruction time6.8 sec per cross section 1024x1024 pixels (float point cone-beam reconstruction, 0.9 deg./step) Radiation safety<1uSv/h at any point of the instrument surface

24 Mikro-CT -przykłady Kolano myszy Wnętrze kości

25 Mikro-CT –przykład cd Shadow X-ray ImageCross section of a capacitor 3D Reconstruction of capacitor

26 Mikro – CT przykłady Przekrój ołówka Przekrój opornika (D – 10 mm)

27 mikro CT – obrazy kolorowe S. Park;

28 CD 3D - przykład YXLON International X-Ray GmbH, D.Shlösser, R. Rowecki

29 CT – zalety i wady Wyznacza b. dokładnie strukturę PRZESTRZENNĄ a przy stosunkowo małym natężeniu jest to metoda bezpieczna w badaniu obiektów biologicznych Zalety Wady Długotrwała ekspozycja (?) – możliwe obrazy obiektów NIERUCHOMYCH

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