M edical T V applications / XQ 13 9 5
D A T A S H E E T
1” High Resolution Resistron® –
Camera Tube
XQ 1395
For use in medical TV application
Antimonytrisulfide – photoconductive layer (Sb
2
S
3
)
Separate mesh connection (grid-4-electrode)
Description
Camera Tubes are the key component of
High Performance X-ray TV systems in
medical applications. Their high
sensitivity and high dynamic range
combined with high resolution allows
real-time x-ray imaging for any type of
medical imaging as during critical
surgeries. The Resistron® camera tube
XQ 1395 is a 1” diameter image tube with
magnetic focusing and magnetic
deflection method for camera installations
adapted through optics to X-ray image
intensifiers.
Features and Benefits
High sensitivity
Video high-resolution
High dynamic range
Real-time X-ray imaging
Low noise imaging
Applications
Radiography
Cardiology
C-arm
Angiography
Radiosurgery
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DATASHEET
Table of Contents
Physical Dimensions of XQ 1395 __________________________________ 3
Typical Operating Data and Characteristics XQ 1395 __________________ 3
Maximum Ratings (absolute values)________________________________ 4
Blemish Specification ___________________________________________ 5
- Test Conditions_______________________________________________ 5
- Target Zone _________________________________________________ 5
Possible Number, Size and Location of Blemishes_____________________ 5
Characteristics of Spectral Sensitivity. Current, Modulation Depth and Lag__ 6
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DATASHEET
Physical Dimensions of XQ 1395
(All dimensions in mm)
Figure 1
Image Tube dimensions
Description
Max. length
Max. diameter
Faceplate thickness
Weight
Base
Socket
Focusing and deflection assembly
Mounting position
Parameter
162 mm
28.6 mm
2.45 ± 0.15 mm
approx. 60 g
8 pin special type
1030 (for printed circuits)
1031 (with solder tags)
BV 200, BV 400
any
Typical Operating Data and Characteristics XQ 1395
Description
Heater voltage
Heater current
Grid no. 1 voltage
Grid no. 1 cut-off voltage
Grid no. 2 voltage
Grid no. 3 voltage
Grid no. 4 voltage
Blanking voltage applied to grid no. 1
Blanking voltage applied to cathode
Focusing method
Deflection method
Inter-electrode capacitance –
signal electrode to all other electrodes
Scanned area with a 3:4 aspect ratio
Useful diameter of the photoconductive layer
Signal electrode voltage
Spectral response
Gamma value
Resolution of center picture
(grid 3=620 V, grid 4=860 V)
Parameter
6.3 V (1)
95 mA (1)
indirect by AC or DC, series or parallel supply
see operating instructions point 2.5
-50 … -100 V
300 V
560 … 645 V (2)
860 V (2)
75 Vp-p
25 Vp-p
magnetic
magnetic
3 - 5 pF (3)
15.0 x 20.0 mm²
approx. 17 mm
20 …. 50 V (4)
see diagram
0.7 ± 0.15
> 60 lp/mm
(5)
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DATASHEET
Maximum Ratings (absolute values)
Full size scanning of the 15.0 mm x 20.0 mm area of the photoconductive layer must be assured.
Description
Grid no. 1 voltage positive
Grid no. 1 voltage negative
Grid no. 2 voltage
Grid no. 2 load
Grid no. 3 voltage
Grid no. 4 voltage
Peak heater-cathode voltage
heater negative with respect to cathode
heater positive with respect to cathode
Faceplate temperature
Parameter
max. 0 V
max. –150 V
max. 450 V
max. 0.8 VA
max. 900 V
max. 1000 V
max. 125 Vp
max. 10 Vp
max. 70° (12)
C
(1) If the maximum variation of the heater voltage exceeds the absolute limit of ± 5 %, the
operating performance of the tube will be impaired and its life shortened. If series
connection is applied, the heater voltage may not exceed 9.5 V. It is recommended to use a
current limiter. The preheating time of the tube should be 1 minute minimum with beam
current off.
(2) Optimum focusing of the electron beam is obtained by adjusting either the focusing coil
current or varying grid no. 3 voltage. Grid no. 3 voltage should be between 65 and 75 % of
the voltage applied to grid no. 4 voltage. Optimum resolution is obtained by highest grid no.
4 voltage. Higher grid no. 4 voltage requires an increase of deflection current. If grid no. 3
voltage is increased, a higher focusing current will be necessary. The optimum ratio of grid
no. 4 to grid no. 3 voltage depends on the type of focusing and deflection assembly. An
improper voltage ratio may produce brightening or darkening in the faceplate corners.
Generally, grid no. 4 voltage must be higher than grid no. 3 voltage.
(3) This capacitance which is the effective output impedance of the tube (resistive component
approx. 100 M ) increases if the tube is mounted in the focusing and deflection assembly.
(4) The upper limit of the signal electrode voltage must be adjusted to the value indicated in
the test sheet. This value applies to a faceplate temperature of 30 ± 2° To obtain an
C.
optimum life time the dark current should not exceed the value of 30 nA.
(5) Measured with video amplifier of suitable bandwidth.
(6) At a color temperature of 2856 K.
(7) The signal current is the target output current, measured with an integral measuring
instrument, minus dark current. During the measurement the scanned area is uniformly
illuminated.
(8) Non-uniformity of the signal current depends on the quality of focusing and deflection
assembly, deflection linearity and beam alignment. The black to white transition in the
middle of the test pattern is set as 100 % value. The maximum signal deviations within a
radius of 6.4 mm are measured.
(9) The modulation depth is measured at the faceplate center at 20 lp/mm in comparison with
1.3 lp/mm. The modulation depth depends on the signal current. The signal current
amounts to 200 nA, the beam current is adjusted for stabilising a signal of 500 nA.
(10) The decay lag is measured in percent of the signal current, which is preset at 250 nA. The
beam current is adjusted for stabilising a signal of 500 nA.
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DATASHEET
Blemish Specification
- Test Conditions
The tube shall be centred and focused according to the operating and adjusting instructions for
optimum performance.
Illumination should be adjusted to a signal current of 250 nA at a beam current for stabilising a
signal of 500 nA.
- Target Zone
A uniformly illuminated field with an aspect ratio of 3:4 and a scanned area of 15.0 mm x 20.0 mm
shall be displayed on the target of the camera tube. According to the following drawing the scanned
area is divided into three zones 1, 2 and 3.
The blemish size is measured in percent of the picture height. The equivalent numbers of TV-lines
are indicated for comparison purposes only. Black and white spots are equally weighted.
Measurement of blemishes will be performed with and without target illumination. The minimum
separation between two target spots must be greater than the diameter of the larger one, otherwise
the combination is considered as a whole. Target spots with a diameter
≤
0.2 % of the picture height
as well as blemishes with a modulation depth
≤
10 % are not counted, unless an accumulation
causes a smudged appearance.
Blurred spots, streaks, stripes, mesh defects and mottled or grainy background are only permitted
up to a noise amplitude of 10 %.
Figure 2
20 mm
10 mm
15 mm
5 mm
Zone 1
Zone 3
Zone 2
Target Zone of Image Tubes
Possible Number, Size and Location of Blemishes
Specification
Blemish size in % of picture height
Blemish size TV lines
15.0mm = 100 %
625 line system
> 0.7
>4
> 0.5 …
≤
0.7
>3…4
> 0.2 …
≤
0.5
>1…3
Max. permissible total number of blemishes
Maximum permissible number of blemishes
Zone 1
Zone 2
Zone 3
0
0
0
0
0
2
4
0
1
4
Blemishes outside the zone are not counted.
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Camera Tube
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