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Checking the Superimposed ADC Measuring Field with FLUROSPOT H . . . . . . . 6 - 3
Measurement field sizes in zoom mode (RX unit with 40-4 HDR I.I.) . . . . . . . . . 6 - 4
Letzte Seite des Kapitel 0
POLYDOROS SX 50/80Register 4RX63-050.034.12TD AX 6Siemens AG
Rev. 0105.96Medical Engineering
Prerequisites1
General Remarks1
• This document is applicable for the followi ng generators:
POLYDOROS SX 50/80
The SIRECON 2 connection is an expansion to the basic generator (see generator installation instructions) and is comprised of the D270 board, the D271 assembly, the
multiplier extension cable as well as the connections parts and installation materials.
When using the oscilloscope, the ground wire in the power cable
may not be disconnected under any circumstances. For measurements in which any ground loops may be present which may
cause the measurement result to be adversely affected, use the
TEK isolating amplifier and the triggering option.
Safety-technical Information1
The "Safety-technical Informati on" contained in generator ins tallation instru ctions must be
observed.
• Checks or adjustments which must be carried out under radi ation are labeled in the
instructions with the radiat ion warning symbol . While these work steps are being
carried out, observe the appropr iate radiation protection measur es (see TI 216)
Remarks Regarding Start-up1
• With systems which have been preassembled and tested at the fact ory per the BZ (can
be seen from the accompanying "Test Certi ficate, Jumper Protocol” in the Regist er
labeled ”Protocol”), only ver y brief checks and adjustments need to be ca rried out.
• Enter the results from the measurements labeled wit h ”” in the Test Certificate in the
column marked ”Start-up Measurement Value” .
POLYDOROS SXRegister 4RX63-050.034.12TD AX 6Siemens AG
Rev. 0105.96Medical Engineering
Switch on the dose meter at least 15 minutes prior to the measurement and then calibrate it.
No additional filter may be selected at the collimator.
PrerequisitesChapter 1
Page 3 of 4
Image Quality in Fluoroscopy Systems1
Prerequisites and General Remarks Regarding Fill ing Out the IQ Test Certificate for
Fluoroscopy Systems:
Beam geometry (collimation and centering) of the applicat ion equipment must be in order.
When filling out the "Test Certificate / Fluoro and DFR/DR Systems",
RXD0-000.037.01... observe the foll owing:
• In Chapter 1, enter the Setting Instruct ions containing the data for f luoroscopy in the IQ
tests used for start-up .
• In Chapter 1.1, enter the customer data and the BZ Number.
• In Chapter 1.2, enter the configured co mponents along with their designation. Part No.
and Serial No.
• In Chapter 1.3, list the test equipment used al ong with designation and Serial No. and
the date until which the calib ration is still valid.
• In Chapter 2, enter the data from the configur ed image intensifier.
• After each measurement, enter the results i n the "Test Certificate/Fluoro and DFR/DR-
Systems".
• Compare the measurement results with the reference val ues.
• If tolerances are exceeded, determine the r eason and the error or correct the incor rect
setting before continuing with the chec ks. Otherwise it is possible that subsequen t
measurements will be adversely infl uenced.
• Enter the BZ number and the data on each page of the "Test Certi ficate/Fluoro and DFR/
DR Systems" to assure that there will be cl ear organization of the certific ate pages.
• There may not be any empty fields in the complete d certificate. Enter n.a. (not
applicable) in fields in whic h no entry can be made. Fields which can only be f illed in
during customer start-up are mark ed in the certificate as such.
Pencil may not be used to fill out the cer tificate; do not use Tippex to make corr ections.
• Record the start-up instructions whi ch are used for customer start-up. These cont ain
information pertaining to perf ormance of IQ texts and must be recorded in t he "Test
Certificate/Fluoro and DFR/DR Systems" in Chapter 1.
• The tester at the factory and the tester ca rrying out the start-up must si gn and date the
"Test Certificate/Fluoro and DFR/DR Systems" in Chapter 1-1.
• Cross out incorrect entries and wri te the correct value next to it al ong with the date and
the tester’s initials.
Siemens AGTD AX 6RX63-050.034.12Register 4POLYDOROS SX
Medical EngineeringRev. 0105.96
Chapter 1Prerequisites
Page 4 of 4
At the Conclusion of the Test:
• Leave the "Test Certificate/Fluoro and DFR/DR Syst ems" RXD0-000.037.01... with the
system and file it in Register 9 of the Sys tem Binder.
If the System Binder is not availabl e, file the Test Certificat e in Register 9 of the
Generator Binder.
POLYDOROS SXRegister 4RX63-050.034.12TD AX 6Siemens AG
Rev. 0105.96Medical Engineering
NOTICE
Preparations for dose rate setti ng2
Notes on the VIDOMATIC P2
• For KK version systems, 2 fluoroscopy characte ristic curves can be programmed
(Fluoro 1 and Fluoro 2).
• For systems in RAS version, up to 4 fluoroscopic characteristic curves can be
programmed if they can be selected from the uni t (Fluoro 1. . . Fluoro 4).
• Dose-saving zoom can be programmed with existing iris di aphragm.
• Customer-specific fluoroscopy curves can be generated within the range of C80...C99.
Normal fluoroscopy (max. 450 W)
• Can be selected from fluoroscopy characteri stic curves in the firmware (C00, C01, C02,
C03, C10, C11)
High-contrast fluoroscopy (max. 1200 W, with modified high-volta g e generator, as
from Serial No. 01056, max. 2000 W)
• Can be selected from fluoroscopy characteri stic curves in the firmware (C40, C41, C42,
C50, C60, C61, C62, C63, C64, C65)
Therapy simulation
Chapter 2
Page 1 of 4
• It is possible to program 2 fluoroscopy c urves which can be selected from:
- fluoroscopy characteristi c curves in the firmware (C40, C41, C42, C50, C60, C61, C62,
C63, C64, C65)
Suppression of light distributor (220 V, not for I.I.40)2
Voltage peaks caused by switching off the motor voltage of the
mirror motor in the light distributor result in generator interferences
• For the reason, generally incorporate two RC element s, Part No.31 33 147 B2003
parallel to the motor.
For 220V mirror motor voltage, reconnect
jumper x7 on board D271
M 8.7
M
M 8.8
100Ω
0.22µF
x7
3
24V mirror (40cm I.I.)
2
220V mirror
1
M 8.3
Siemens AGTD AX 6RX63-050.034.12Register 4POLYDOROS SX
Medical EngineeringRev. 0105.96
Chapter 2Preparations for dose rate setting
Page 2 of 4
Fluoroscopic dose rate
(Excerpt from "Test Certificate for Fluoro and DFR/DR Systems")
Basic info on dose/dose rate measurement on image intensifier workstations
For dose measurement at the I.I. input (K
(), attach the dose measuring chamber centrally to the radiation field, as close as pos-
K
B
sible to the I.I.; in the case of spotfil m devices, place it in the cassette shaft. If this is not
possible, measure the dose (K
) or the dose rate () in front of the attenuating layers:
Tg
- With OT units on the tabletop
- With UT units on the spotfilm device rear panel
- With C-arm units on the grid
Using the correction factor m (unit attenuation factor), the value at the I.I. input is calculated.
The unit attenuation factor contains all attenuating layers between the patient and the
image receptor , inc luding t he distan ce fac tor; i t is i ndic ated in th e unit tes t certif icat es and
can also be calculated by multiplication of the attenuation factors of all individual layers.
The radiation attenuation of 6% resulting from the dose measuring chamber must be
taken into account as well (factor 0.94).
Determination of the dose/dose rate directly at the I.I. input
) or dose rate measurement at the I.I. input
B
K
Tg
2
DoseDose rate
Meas. chamber in the I.I. planeK
Meas. chamber in front ofK
=KBg x 0,94= x 0,94
B
x 0,94 x 0,94
K
TG
==
B
K
B
K
B
K
Bg
K
Tg
attenuating layersmm
Special case 1: Dose rate measurement if the ADC measuring field is larger than
the dose measuring chamber:
Allow the ADC to adjust with 2.1 mm Cu prefi ltration, chan ge over to ST OP , now place
the dose measuring chamber in the beam path and measure the dose rate. The factor of
0.94 must not be taken into account in this case.
Special case 2: Dose measurement if the dominant is larger than the dose measuring chamber:
Place 2.1 mm Cu and the dose measuring chamber in the beam path, release an exposure and measure the dose (KBg or KTg) and the mAs value (Qg1). Remove the dosimeter from the beam path, release an exposure and measure the mAs value (Qg2).
Calculate the dose at the I.I. input (KB)
Q
KB=K
POLYDOROS SXRegister 4RX63-050.034.12TD AX 6Siemens AG
Rev. 0105.96Medical Engineering
x;KB=x
Bg
Q
g2
g1
K
m
Tg
Q
Q
g2
g1
Preparations for dose rate setti ngChapter 2
s
Page 3 of 4
Determining the unit attenuation factor from the indi vidual attenuation factors
m
unit
attenuation
factor
Attenuation factor of tabletop, spotfilm device rear panel etc.m
Attenuation factor of scattered radiation gridm
Attenuation factor of Iontomat chamberm
2
r
Attenuation factor distance factormA =
B
r
T
Unit attenuation factor m = mT x mR x m? x mA . . . . . . .
Cu filter
r
B
r
T
K
Tg
Measuring chamber in front of attenuating layer
Tabletop or spotfilm device rear panel
Grid
Iontomat chamber
K
Bg
K
B
Measuring chamber in I.I. plane (cassette shaft)
I.I. input
T
R
I
/= Dos e /dose rate directly at the I.I. input
K
K
B
B
/= Measured dose/dose rate in the I.I. plane
K
K
Bg
Bg
/= Measured dose/dose rate in front of the attenuating layers
K
K
Tg
Tg
r
B
r
T
= Source-image receptor distan ce
= Distance between source and beginning of the attenuati ng layers
Siemens AGTD AX 6RX63-050.034.12Register 4POLYDOROS SX
Medical EngineeringRev. 0105.96
Chapter 2Preparations for dose rate setting
Page 4 of 4
Formulas for calculating the dose/dose rate in the measuring plane for the dose/
dose rate setting
During setting, the dose or dose rate required directly at the I.I. input must be converted
into the measuring plane (I.I. plane or in front of the attenuating layers). For this, use the
modified fo rmulas. .
Dose
K
Meas.chamb. in I.I.plane KBg==
B
0.94
Dose rate
K
B
K
Bg
0.94
Meas.chamber in front of
attenuating layersK
K
==
Tg
B
0.94
K
Tg
K
B
0.94
x m
x m
Remark: The radiation attenuation resulting from the dose measuring chamber is already
taken into account during setting
(for adjustment: remove the dose measuring chamber from the beam path).
Do not use the f actor of 0.94 for calculating the dose r ate to be set.If the dose/
dose rate is checked (not set), the factor of 0.94 must be taken into account.
Example for determining the correction factor
Correction factor m (total) =
(source-I.I. distance/source-measuring chamber distance)
2
x m-factor (Iontomat camber) x m-factor (Raster)
x m-factor (tabletop etc., if between dose measuring chamber and I.I.) etc.
When setting the dose/dose rate, multiply the dose/dose rate required at the I.I.
input by the correction factors.
e.g.174 nGy/s x (m
A
x m
R
x m
x mT)
I
174 nGy/s x (1.17 x 1.7 x 1.1 x 1.1) =
174 nGy/s x2.4 = 408 nGy/s
µR=8.7 nGy)
(1
Record the correction factor m in Chapter 4.1 of the "Test Certificate for DL and DFR/DR
Systems".
The test certificate is filed in Register 9 of the System or Generator Binder.
POLYDOROS SXRegister 4RX63-050.034.12TD AX 6Siemens AG
Rev. 0105.96Medical Engineering
NOTICE
Startup3
Programming the POLYMATIC3
General Remarks3
In system shipments, the programming has already been carried out at the factory.
In subsystems, the expansions to be connected during start-up must be programmed
appropriately.
File the test certificate"Fluoro and DFR/DR Systems", RXD0-
000.037.01... in Register 9 of the System or the Generator Binder.
A help function is available in the Service Software beginni ng with Service Software
VE00A.
• By clicking on the "HELP" box in the particular window or
• by pressing the "F1" function key on the PC or
• in the "Help" / "Index" in the main menu
valuable information and the required programming and entries can be selected.
Chapter 3
Page 1 of 22
Programming3
1 Establishing the Generator - Service PC Connection
2 "System" / "Connect"
3 "Configuration" / "Options..." / "Page 2..."
• Set the dose and dose rate units of measurement.
Siemens AGTD AX 6RX63-050.034.12Register 4POLYDOROS SX
Medical EngineeringRev. 0105.96
Chapter 3Startup
Page 2 of 22
Fluoroscopy Programming3
The Test Certificate "Fluoro and DFR/DR Systems", RXD0-000.037.01... is filed in
Register 9 of the System or Generator Binder.
• Select "Fluoroscopy" (if not already sel ected!)
• Select "FC-Details..."
• Appropriately program the "Primary FC-Data" and con firm with "OK".
• Appropriately program the "VIDEOMATIC P" and confirm with "OK".
• Record the values programmed in the Test Certificate:
SID (focus-I.I. distance) in Chapters 4 and 4.2,
Over-table units: 115 cm
Under-table units: max. SID (do not move out the Distator)
C-Arm units: 100 cm
I.I. formats in Chapter 4.1.2
Zoom dose rate (Zoom dose factors) in Chapters 4.1.2 and 4.2
Dose rate in Chapters 4.1 and 4.2
The fluoroscopy curves used by the customer in Chapter 4.2.
Additional Information:3
• "maximum fluoro rate":
- Therapy Simulation:OPTILIX 150/12/50 C:max. 1000 W
- High Contrast Fluoro:MEGALIX 125/40/82 C:max. 1200 W
(with HV generators beginning with Ser. No. 01056 max. 2000 W)
with the fluoro footswitch wit h the 2nd pressure point
- "Normal Fluoro"all other X- ray tubesmax. 450 W
• When the image intensifier model is selected, al l input boxes are assigned default
values (see also the IQ reference value l ist).
• The dose rate selected is always relative to the full format
(largest I.I. form at!)!
• Program the same dose rate values for Automatic 1 and 2
• Fluoroscopy blocking: "Block on"
according to regulations in Germany and in DHHS countries, fluoroscopy must be
blocked after 5 minutes.
• If fluoroscopy is configured after the "test shots" of the X-ray tube, the X- ray tube test
shots must be carried out again
("Adjustment"/"Tube 1... "/"PT Emulation...": Module J05, J0 6 and J07")!
POLYDOROS SXRegister 4RX63-050.034.12TD AX 6Siemens AG
Rev. 0105.96Medical Engineering
StartupChapter 3
Page 3 of 22
Excerpt from the "Reference Value List for Fluoro and DFR/DR
Systems":
Fluoroscopy dose rate at the I.I. input3
2.1 mm Cu filter, X-ray tube voltage 65 - 85 kV
Zoom Dose
Factors
PL SX
50/80
1:
2.0:
4.0:
5.0
1:
1.8:
3.3:
5.5
1:
2.1:
3.8
BV-Typ /
I.I. Type
40 cm HD40
40 cm HDR40
33 cm HD33
Formate /
Formats
28
20
14
30
22
17
23
17
1, 2
Dosisleistg.
Dose rate
(nGy/s)
87
160
315
(435)
87
120
255
440
113
240
450
3
Hochkontrast /
High cont rast
(nGy/s)
139
255
505
(695)
139
195
405
700
3
33 cm HDR33
22
17
13
27 cm27
17
14
Sirec.Komp.
(alt/old)
23 cm HDR/HDLE
Sirec.Komp.
(neu/new)
U
Multiplier
Tolerance: I.I. full format
Tolerance of indirect dose rate control
Values in brackets ( ) apply if TV iris diaphragm is configured.
Urology: With TV iris diaphragm for Automatic 2, set doubl e the dose rate.
= 700 – 950 V
22
17
23
17
13
± 10%; at Zoom formats approximate value only.
113
235
405
680 (430)
174
445
655 (435)
261
435
261
440
730 (470)
*1
1 nGy/s = 0.115 µR/s / 1 µR/s = 8.7 nGy/s
±1 kV, mA: ±10%
1:
2.3:
3.8:
6.4 (3.8)
1:
2.5:
3.7 (2.5)
1:
1.7
1:
1.8:
3.1 (1.8)
*1effecti ve beginning 7.93 (possible only with masked Multiplier)
Siemens AGTD AX 6RX63-050.034.12Register 4POLYDOROS SX
Medical EngineeringRev. 0105.96
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