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MULTISLICE CT

MULTISLICE CT. SINGLE vs MULTI. CT EVOLUTION. 1998 MULTISLICE CT SCANNERS INTRODUCED AT RSNA MEETING. SINGLE SLICE CT LIMITATIONS. SPEED PERFORMANCE 3D,MPR,MIP Z-AXIS RESOLUTION MPR LOW ACCURACY 360 LIA ( IMAGE QUALITY & ARTIFACTS) CT ANGIO LIMITATIONS MORE INTRAVENOUS CONTRAST.

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MULTISLICE CT

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  1. MULTISLICE CT

  2. SINGLE vs MULTI

  3. CT EVOLUTION

  4. 1998 MULTISLICE CT SCANNERS INTRODUCED AT RSNA MEETING

  5. SINGLE SLICE CT LIMITATIONS • SPEED PERFORMANCE • 3D,MPR,MIP Z-AXIS RESOLUTION • MPR LOW ACCURACY • 360 LIA ( IMAGE QUALITY & ARTIFACTS) • CT ANGIO LIMITATIONS • MORE INTRAVENOUS CONTRAST

  6. SLICE THICKNESS IN SINGLE SLICE CT DETERMINED BY: • PITCH • PRE-PATIENT COLLIMATION

  7. MULTISLICE CT COLLIMATION • BEAM FALLS ON THE ENTIRE MULTIROW DETECTOR ARRAY 8 MM WIDE BEAM FALLING ON FOUR DCETECTORS CAN PRODUCE: 4 –2MM SLICES

  8. SINGLE SLICE SPIRAL MULTISLICE FAN CONE BEAM GEOMETRY

  9. BEAM GEOMETRY • AS THE NUMBER OF DETECTORS IN A MULTIROW DETECTOR ARRAY INCREASES THE BEAM BECOMES WIDER TO COVER THE 2D DETECTOr ARRAY. LARGER # OF ROWS IN THE DETECTOR ARRAY WILL RESULT IN A WIDER BEAM IN Z-AXIS DIRECTION ( CONE BEAM)

  10. POST DETECTOR COLLIMATION IN MULTISLICE CT • THE COLLIMATORS ARE POSITIONED BETWEEN DETECTOR COLUMNS.

  11. IMAGE RECON IN MULTI SLICE CT • SPECIAL FAN BEAM RECON ALGORITHMS HAVE BEEN DEVELOPED

  12. INSTRUMENTATION

  13. DAS • ALMOST ALL MULTISLICE CT SCANNERS ARE BASED ON III GENERATION SYSTEM DESIGN ROTATE-ROTATE

  14. GENERATOR • HIGH FREQUENCY GENERATOR 60 KW OUTPUT.

  15. X-RAY TUBE • ROTATING ANODE TUBE WITH VERY HIGH HEAT CAPACITY

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