Important Technical Features / Parameters

Siemens SOMATOM Definition AS+ ( 128 Slice / Rotation )

Philips Brilliance iCT SP ( 128 Slice / Rotation ) Remarks

Minimum Full 360 degree gantry Rotation Time

300 msec in standard mode. ( Single Segment Temporal Resolution 150 ms )

300 msec in standard modes (Upgradable to 270 msec with Rate Responsive Toolkit only for Cardiac Mode) ( Single Segment standard Temporal Resolution 150 ms )

Comparable

Gantry Aperture 78 cm 70 cm SOMATOM Definition AS+ offers the largest Gantry Bore of the radiology segment to facilitate trauma / non-co operative / claustrophobic / ICU ( with accessories ) & therapy planning patients

Gantry Tilt +/- 30 degrees +/- 30 degrees ComparableGantry Z-Axis Depth 93.5 cm 97.0cm SOMATOM Definition AS+ offers the slimmest possible

Gantry of the MD segment to facilitate easier intervention procedures.

Detector Material 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 Siemens is the pioneer of this Z Sharp technology - which today , industry follows with different names like Smart Focal Spot (Philips)

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)

Total Acquisition Speed in Terms of Number of Slices / Sec

426 slices/sec 426 slices/sec Comparable

No. of effective channels per row 1472 1344 The SOMATOM Definition AS+ offers much higher receiver channels for more raw data / more crisp IQ.

Number of Projections Upto 4608 / 360 degree rotation Upto 2320 / 360 degree rotation 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.

Generator Rating 100 KW 100 KW ( 120 KW Option ) ComparableTube Technology Siemens unique STRATON X Ray Tube iMRC X Ray Tube The SOMATOM Definition AS+ offers latest

technology Direct Anode Cooling X Ray Tube.Tube Anode Heat Storage Siemens-Unique "0 MHU" ultra-compact STRATON

tube with extremely high cooling capacity (equivalent to 50 MHU based on conventional tube technology)

Spiral Groove Bearing - equivalent to 30 MHU Comparable

Tube Anode Cooling Rate 7300 KHU/min 1600 KHU/min The SOMATOM Definition AS+ offers latest technology Direct Anode Cooling X Ray Tube for much better clinical performance.

KV Output 80, 100, 120, 140 KV 80, 120, 140 KV ComparablemA Output 20 to 800 mA in steps of 1mA 10 to 850 mA in steps of 5mA ComparableReal 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)

ACS Automatic Current Selection + Z DOM + D DOM - Not real time & on the fly dose regulation. Based on initial Topo data - potential problem area - not proper dose control in case of change in patient position.

The SOMATOM Definition AS+ scans with much less patient dose & is considered as one of the most dose efficient CT Scanner in the industry.

Short Comparison - Siemens SOMATOM Definition AS+ ( 128 Slice ) & Philips Brilliance iCT SP ( 128 Slice ) CT Scanners

A. GANTRY

B. DETECTOR

C. X-RAY GENERATOR & TUBE

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Important Technical Features / Parameters

Siemens SOMATOM Definition AS+ ( 128 Slice / Rotation )

Philips Brilliance iCT SP ( 128 Slice / Rotation ) RemarksShort Comparison - Siemens SOMATOM Definition AS+ ( 128 Slice ) & Philips Brilliance iCT SP ( 128 Slice ) CT Scanners

Special / Additional X Ray Dose Reduction Technique for reduction of un-used patient dose.

Adaptive Dose Shield - Intelligent & automatic X Ray dose shielding on collimator end to reduce the pre & post scan additiolal exposute to the patient during the scan.

Eclipse Dose Right Adaptive Dose Shield is unique to Siemens for additional X Ray dose reduction caused by pre & post scan for a multi slice detector.

Hardware Specifications Quad Core 2.66 GHz High Performance Computer System

Quad Core 2.66 GHz High Performance Computer System

Comparable

Image Reconstruction Speed 40 images/sec 20 images/sec SOMATOM Definition AS+ offers more advanced HW & SW for faster data reconstruction & transfer.

Workstation Syngo CT 3D - MM Workstation with fully integrated Cardiac Engine

Extended Brilliance Workplace Comparable

Max Topogram Length 160 cm 160 cm ComparableMax Schnabel Range 160 cm 160 cm ComparableReconstruct able Slice Thickness Down upto 0.400 mm Minimum is 0.625 mm SOMATOM Definition AS+ can go upto much thinner

slices for higher spatial resolution. This is possible due to UFC Detector material.

Max Spatial Resolution at 0% MTF 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.

Philips uses GOS detectors and they are 30% less efficient than UFC detectors

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.

Temporal Resolution - 1 sector recon 150 msec 150 msec ComparableTemporal Resolution - 2 sector recon 75 msec 75 msec Comparable

Connection Value 140 KVA 225 KVA Definition AS+ is more energy efficient & requires much less power connecrion.

No. of High End Multi Slice / Dual Source CT Units in India

DSCT - 9 128 Slice - 10 64 Slice - 4040 Slice - 16

DSCT - 0 ( NA ) 128 Slice - 0 ( NA ) ,iCT SP in modi hosp new delhi 64 Slice - 3540 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

F. SCANNING PARAMETERS

G. CARDIAC CT

H. POWER REQUIREMENT

D. ADDITIONAL DOSE REDUCTION TECHNIQUE

E. MAIN CONSOLE / WORKSTATION

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