This document compares three CT scanners from different manufacturers - the Philips Brilliance iCT, Siemens Somatom Definition AS+, and Toshiba Aquilion One. Key differences between the scanners include the aperture size, detector array length, number of simultaneously acquired slices, data transmission rates, hardware features for resolution, and couch specifications such as length, weight limits, and movement ranges.

1. COMPARISON BETWEEN 128 TO 328
COMPUTED TOMOGRAPHY SLICE
SCANNERS
BY: BISHAL KHANAL

2. MANUFACTURER SCANNER MODEL
PHILIPS BRILLIANCE iCT
SIEMENS SOMATOM DEFINITION AS+
TOSHIBA AQUILION ONE

3. Philips
brilliance
iCT
Siemens
SOMATOM
definition As+
Toshiba
Aquilion
one
Scanner type 3rd generation 3rd generation 3rd generation
Aperture 70 78 72
Focus- isocentre
Distance(mm)
570 595 600
Focus-detector
distance(mm)
1040 1085 1072
Slip ring for power
supply
Low voltage low voltage Low voltage
Slip ring for data
transmission
optical RF RF
Tilt range(degree) No +,-30(0.5
degree
increment)
+,-22
Gantry

4. Philips
brilliance iCT
Siemens
SOMATOM
definition AS+
Toshiba
aquilion ONE
Tilt for helical
scanning
No No Not available
Positioning light-
planes
Transaxial
(internal and
external),
sagittal and
coronal
Transaxial,
sagittal, coronal
Transaxial,
sagittal, coronal
Positioning light-
type
Laser Laser Laser
Positioning light-
accurracy (at
center of gantry)
[mm]
+,-0.5 +,-1 +,-1

5. X-ray generator
Philips brilliance
iCT
Siemens
SOMATOM
definition AS+
Toshiba aquilion
ONE
Type High frequency High frequency High frequency
Location Rotating frame Gantry In gantry
Method of
generator
Air cooled Air or water Air
Power rating[Kw] 120 100 70
Kv Setting 80, 120, 140 80, 100, 120, 140 80, 100, 120, 135
mA range(and
step size
10-100 (in 1 mA
steps)
20-800
(1 mA steps)
10-50(mA steps)
50-580(10mA steps)
Maximum mA
for each kV
80kV: 650mA
120kV: 1000mA
140kV: 750mA
80kV: 550mA
100kV: 650mA
120kV: 800mA
140kV: 714mA
80kV: 580mA
100kV: 580mA
120kV: 580mA
135kV: 510mA

6. X- ray tube
Philips
brilliance iCT
Siemens
SOMATOM
definition AS+
Toshiba aquilion
ONE
Type and make IMRC Siemens straton C x B – 750E
Focal spot size(s)
[mm], quoted to
IEC 336/93
standard
0.6 x 0.7
1.1 x 1.2
0.7 x 0.7
0.9 x 1.1
o.9 x 0.8
1.6 x 1.4
Moving(dynamic/
flying) focal spot,
xy- plane
Yes Yes No
Moving(dynamic/
flying) focal spot,
z-axis
Yes Yes No
Setting at which
focal spot changes
Small focal spot
in HR/UHR
mode; not kW
limited
Not power
dependant
80 Kv: 410mA
100kV: 330mA
120kV: 270mA
135kV: 240mA

7. Philips Siemens Toshiba
Total filtration at max
kV(inherent+ beam
shaping filter) on
central axis [mm Al
equivalent 120 Kv]
4.8 140 kV 6.8 4.8(L wedge filter)
4.8(M wedge filter
3.9(S wedge filter)
Half value layer of x-
ray beam at 120 kV(or
nearest) [mm]
6.9 +,- 0.5 120kV 8.7 Confidential
Anode heat
capacity[MHU]
30 MHU equivalent
with real time image
30
equivalent
7.5
Maximum anode
cooling rate [kHU /
min]
1608 7300 1386
Method of tube
cooling
oil to air Direct
oil
liquid
Expected tube
life[amp-hours]
1 year unlimited
guarantee
3 years 300000 rotations

8. Detection system
Philips
brilliance iCT
Siemens
SOMATOM
definition
AS+
Toshiba
aquilion ONE
Detector type Solid state array Solid state
array
Solid state array
Detector material Gadolinium
oxysulphide
(GO)
Siemens Gadolinium
oxysulphide
(GO)
Decay constant Info. Not available 3 3
Maximum number of
simultaneous acquired
data sets(number of
‘slices’)
128 128 320
Sampling frequency for
fastest scan [Hz]
9,6oo(up to 4,800
sample/rev)
4608 2400

9. Philips birlliance iCT Siemens Toshiba
Sampling frequency
for fastest scan[
17,778(up to 4,800
sample/rev
4608 2572
Data transmission
rate[Mbps]
5280 8500 20000
Number of detector
elements per
row(excluding
refrence detector)
672 736 896
Number of refrence
detector elements
per row
1 n.a.(refrence
detector is in
tube collimator)
1 (total)
Number of detector
along z-axis
128 64 320
Effective length of
detector element in
z-axis(at
isocenter)[mm]
128 x 0.625 64 x 0.6 320 x 0.5

10. Philips Siemens Toshiba
Total effective
length of detector
array at
isocenter[mm]
80 38.4 160
Quarter detector
shift
No Yes Yes
Hardware features
to improve xy-
plane resolution
Dynamic focal
spot(DFS)
Attenuating
Comb(UHR)
Flying focal
spot(xy)
No
Hardware fearures
to improve z-axis
resolution
Spiral groove
bearing and smart
focal spot
z-sharp/z-UHR
comb
No
Option for slice
upgrade(‘forklift”
essentially
meaning scanner
replacement)
No Yes(forklift) No

11. Couch
Philips
brilliance iCT
Siemens
SOMATOM
definition AS+
Toshiba aquilion
ONE
Couch top
material
Carbon fibre
composite
Carbon fibre Carbon fibre
Couch top length
and width [cm]
243 x 41 Standard: 240 x 5
(multipurpose
table option: 200
246 x 47
Horizontal
movement
range[cm]
190 Standard: 160
(multipurpose
table option: 200)
239
Couch control- on
gantry
Yes(left/right,
front/back)
Left
&right(standard)
Back (option)
Front, left &right
Rear, left &right

12. Philips
brilliance
iCT
Siemens
SOMATOM
definition AS+
Toshiba
aquilion
ONE
Couch controls -in Optional
table side
control
Elevation control
pedals on both
sides of the couch,
additional
controls(I-control
panel) at the table if
ct fluro option
installed
Foot switch
Couch control- on Yes Yes No
Accuracy/reproduci
bility of table
positioning [mm]
+,- 0.25 +,- o.25 +,- 0.25
Horizontal
range(without
extension [mm]
130 Standard:160
(multi purpose
table option:200)
203
Scanner horizontal
range with table top
extension(s) [mm]
175 Standard : 160
(multipurpose table
option : 200)
195

13. Philips Siemens Toshiba
Vertical movement range
out of gantry [mm]
57.8- 102.8 Standard:48-62
(multipurpose table: 55-
92)
33-99
Vertical movement in
gantry[cm]
85.0- 102.8 72-92 78-99
Maximum clearance in
gantry [cm] 17.5
69
58
Minimum couch top
height outside
gantry[cm]
57.8
standard & 300 kg
option: 48 MPT option: 53 33
Maximum weight
allowed on couch [kg] 204
200(standard) or
280(option) 300
Maximum weight[kg] on
standard couch which
still achieves stated
performance
specification eg.
accuracy(mm)
204
200(standard) or
280(option) 230