Difference Between Single Slice and Multi Slice CT Scanner
- 1. Difference Between Single Slice and Multi Slice CT Scanner Presented By. Talha Saleeme 21305 Asad Rasool 21307 Ali Arslan 21309 Zartash Gul 21310
- 2. CT Scan The meaning of the word “tomography.” This Greek word comes from two distinct words “tomos” and “graphe.” “Tomos” means “section or slice” while “graphe” means “drawing.” CT was invented in 1972 by British engineer Godfrey Hounsfield of EMI Laboratories, England
- 5. During its 25-year history, CT has made great improvements in speed, patient comfort, and resolution. As CT scan times have gotten faster, more anatomy can be scanned in less time. Faster scanning helps to eliminate artifacts from patient motion such as breathing or peristalsis
- 6. How Single Slice work? 1. The single slice Ct scan had an x-ray source and a single detector. 2. Data acquisition involved moving both the tube and detector across the scanning plane to acquire a serious of transmission measurements. 3. All data collected through a 180 degree rotation.
- 7. Parts of single slice CT scan 1. Gantry X-ray tube High voltage Generator Detector Pre patient collimator Post patient collimator 2. Table 3. Ups 4. Control panel
- 8. DISADVANTAGES 1. High patient dose 2. Slow performance 3. MPR low accuracy 4. Low image quality 5. Artifacts
- 9. Multi Slice CT Scan The 1980s saw incremental development of CT scanner technology: shorter scan times and increased matrix sizes, until by the late 1980s scan times were down to only 3 seconds and matrix sizes were up to 1024 x 1024. Development continued through the 1990s, with the introduction of spiral (continuous) scanning in the early 1990s and the development of multi-slice scanners, with 4-slice scanners and 0.5 second scan times being 'state-of- the-art' by the end of the century.
- 10. Current Use of CT Scan Development of CT scanner technology continued through the early years of the 21st century, particularly with multi- slice scanners. At the time of writing, high-end scanners were offering up to 320 slices, dual-source and dual- energy x-ray sources
- 11. GE 128 slice CT Scan
- 12. How multislice scanners works? The Multi Slice Ct is special because multiple detectors are placed next to each other so the Ct can collect multiple slice data at the same time (single scan) .
- 13. The Multi slice can work sequential and spiral mode also. In the simplest Multi slice Ct there are rows of detectors. In these, the radiographer/ assistant can set the slice thickness with the help of the collimator just as the conventional Ct. An important thing is that, usually the number of measurable slices is differ from the number of detectors.
- 14. Part of the Multi Slice CT SCAN Gantry 1) X-ray tube 2) High voltage generator 3) Lesser light 4) Cooling system 5) Rows of detectors 6) Variable collimator Control penal
- 15. Advantage 1. Perform special contrast study(biphasic , CT Angiograms) 2. Limiting Radiation doses 3. Improved spatial resolution 4. Reduce Motion artifact 5. Less contrast medium required 6. Change the field area 7. 3D image
- 16. Disadvantages Expensive Delivers High Dose of Radiation Ring artifact
- 17. Generation of CT Scan 1st Generation: Single detector Single X-Tube Pencil Beam Tube rotate at 180 degree
- 18. 2nd Generation: Single x-ray tube Detectors 1-30 Beam fan shape Tube rotate 180 degree
- 19. 3rd Generation: Single x ray tube Detector 400-1000 Beam fan shape Rotate and rotate Use slip ring technology
- 20. 4th Generation: Rotate and stationary X-ray tube Rotate at 360 degree Detector stationary Detectors in ring form Imaging time in sub seconds
- 22. Slip Ring Technology Slip rings are electromechanical device consist of circular electrical conducting rings and brushes that transmit electrical energy across a moving interface. Slip rings originally design to carry AC and DC power from a rotating platform .
- 24. The five pair of larger brushes provide the voltage required by the x ray tube and the 3 pair of smaller one transfer signals from gantry controller. Brushes are used to transmit electrical power to the CT scanner components. There are two types of brushes that can be used wire and composite.
- 25. Ct Scanner Use in Fsd HOSPITAL Ct Scanner Allied Hospital Allied Hospital Independet Hospital DHQ Hospital Mujahid Hospital Aziz Fatima Hospital Shifa Hospital National Hospital 128 Slice (GE Healt) Single Slice (Toshiba) Single Slice (Toshiba) 16 slice (Toshiba) 16 Slice 16 slice (Toshiba) 64 Slice Single Slice (Toshiba)