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Short Comparison - Siemens SOMATOM Definition AS+ ( 128 Slice ) & Philips Brilliance iCT SP ( 128 Slice ) CT Scanners Important Technical Features / Siemens SOMATOM Definition AS+ ( Philips Brilliance iCT SP ( 128 Slice / Rotation ) Parameters 128 Slice / Rotation ) A. GANTRY Minimum Full 360 degree gantry Rotation 300 msec in standard mode. ( Single Segment Temporal 300 msec in standard modes (Upgradable to 270 msec Time Resolution 150 ms ) with Rate Responsive Toolkit only for Cardiac Mode) ( Single Segment standard Temporal Resolution 150 ms ) Gantry Aperture 70 cm 78 cm
Gantry Tilt Gantry Z-Axis Depth
Remarks
Comparable
SOMATOM Definition AS+ offers the largest Gantry Bore of the radiology segment to facilitate trauma / nonco operative / claustrophobic / ICU ( with accessories ) & therapy planning patients Comparable SOMATOM Definition AS+ offers the slimmest possible Gantry of the MD segment to facilitate easier intervention procedures.
+/- 30 degrees 93.5 cm
+/- 30 degrees 97.0cm
Solid State Ultra Fast Ceramic ( UFC ) Detector Material
Conventional GOS - TACH 2 Detector Material
Only Siemens uses the latest Ultra Fast Ceramic ( UFC ) detector material for high resolution & low dose imaging.
No. of Effective Detector Rows / Channels
64 Rows of Detectors/ 128 Acquisition Channel
64 Rows / 128 Channel
No. of Slices per Rotation
128 Slices / Rotation
128 Slices / Rotation
Siemens is the pioneer of this Z Sharp technology which today , industry follows with different names like Smart Focal Spot (Philips) Siemens is the pioneer of this Z Sharp technology which today , industry follows with different names like Smart Focal Spot (Philips) Comparable
B. DETECTOR Detector Material
Total Acquisition Speed in Terms of Number 426 slices/sec of Slices / Sec No. of effective channels per row 1472
426 slices/sec
Number of Projections
Upto 4608 / 360 degree rotation
Upto 2320 / 360 degree rotation
C. X-RAY GENERATOR & TUBE Generator Rating Tube Technology
100 KW Siemens unique STRATON X Ray Tube
100 KW ( 120 KW Option ) iMRC X Ray Tube
Siemens-Unique "0 MHU" ultra-compact STRATON tube with extremely high cooling capacity (equivalent to 50 MHU based on conventional tube technology) 7300 KHU/min
Spiral Groove Bearing - equivalent to 30 MHU
Tube Anode Heat Storage
Tube Anode Cooling Rate
KV Output 80, 100, 120, 140 KV mA Output 20 to 800 mA in steps of 1mA Real Time Dose Modulation During Scanning Yes - "CARE Dose 4D" principle for saving of upto 66% radiation dose - tube current is modulated real time & on the fly during scanning based on attenuation of X-Ray beam through the patient anatomy (Siemens Unique)
1344
1600 KHU/min
The SOMATOM Definition AS+ offers much higher receiver channels for more raw data / more crisp IQ. SOMATOM Definition AS+ provides more number of projections for more raw data for unmatched image resolution. Philips iCT SP offers the minimum projections / roration due to very old GOS detector material. Comparable The SOMATOM Definition AS+ offers latest technology Direct Anode Cooling X Ray Tube. Comparable
The SOMATOM Definition AS+ offers latest technology Direct Anode Cooling X Ray Tube for much better clinical performance. 80, 120, 140 KV Comparable 10 to 850 mA in steps of 5mA Comparable ACS Automatic Current Selection + Z DOM + D DOM - The SOMATOM Definition AS+ scans with much less patient dose & is considered as one of the most dose Not real time & on the fly dose regulation. Based on efficient CT Scanner in the industry. initial Topo data - potential problem area - not proper dose control in case of change in patient position.
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Short Comparison - Siemens SOMATOM Definition AS+ ( 128 Slice ) & Philips Brilliance iCT SP ( 128 Slice ) CT Scanners Important Technical Features / Siemens SOMATOM Definition AS+ ( Philips Brilliance iCT SP ( 128 Slice / Rotation ) Parameters 128 Slice / Rotation ) D. ADDITIONAL DOSE REDUCTION TECHNIQUE Special / Additional X Ray Dose Reduction Adaptive Dose Shield - Intelligent & automatic X Ray Eclipse Dose Right Technique for reduction of un-used patient dose shielding on collimator end to reduce the pre & post dose. scan additiolal exposute to the patient during the scan. E. MAIN CONSOLE / WORKSTATION Hardware Specifications Quad Core 2.66 GHz High Performance Computer System Image Reconstruction Speed 40 images/sec
Quad Core 2.66 GHz High Performance Computer System 20 images/sec
Workstation
Syngo CT 3D - MM Workstation with fully integrated Cardiac Engine
Extended Brilliance Workplace
160 cm 160 cm Down upto 0.400 mm
160 cm 160 cm Minimum is 0.625 mm
17.4 lp/cm at 2% MTF and high resolution up to 30 LP/cm
Only 13 LP/cm in standard mode & upto only 24 LP/cm in Hi-Res mode.
F. SCANNING PARAMETERS Max Topogram Length Max Schnabel Range Reconstruct able Slice Thickness
Max Spatial Resolution at 0% MTF
Philips uses GOS detectors and they are 30% less efficient than UFC detectors
Remarks
Adaptive Dose Shield is unique to Siemens for additional X Ray dose reduction caused by pre & post scan for a multi slice detector.
Comparable SOMATOM Definition AS+ offers more advanced HW & SW for faster data reconstruction & transfer. Comparable
Comparable Comparable SOMATOM Definition AS+ can go upto much thinner slices for higher spatial resolution. This is possible due to UFC Detector material. Even with the recently introduced detector material ( Gemstone ) - which is having better after Glow & absorption characteristic compare to their very old Hi Light Detector Material - it is yet to catch-up the Siemens UFC technology on all the technical aspects like Shorter After Glow / Higher X Ray Absorption Rate ( for low dose imaging ) / Higher Spatial Resolution. ( Gemstone detectors are used by GE is their discovery 750 HD CT but that CT is alos only 64 slice acq /128 slice reconstruction CT ).
Extended Field of View Option
78 cm ( optional )
Not possible
Extended FOV is extremely useful for obese patients & Therapy Planning.
DSCT - 0 ( NA ) 128 Slice - 0 ( NA ) ,iCT SP in modi hosp new delhi 64 Slice - 35 40 Slice - 0 ( NA )
Like the situation all over World , Siemens is now the only established Cardiac CT vendor in the country with comprehensive install base supported by the experiences Application & Service Team.
I. INSTALLATION BASE IN INDIA No. of High End Multi Slice / Dual Source CT Units in India
