### Change APR Data Set

This function opens the window to modify the entire APR data set. Data marked with a
[P] can only be changed in this window via service PC or with the APRMANager.
All other non-marked data can also be changed at the desk and saved thereafter via the button combination RESET (hold it) + the highlighted APR,
but: see ‘APR modifiable by User’.('Change APR Data Set' is not possible with the default Test APR.)

# Note

If only a few APR data sets have to be maintained one can use these functions.

If more APR data sets shall be modified the use of APRMAN.EXE (part of the installation disk) is much easier, more convenient and a lot faster.

[P] APR number: is just a (randomly given) pointer (house number)

This number can be used to copy a data set into another data set. To do so the destination APR number ('Select APR Data Set') has to be filled in the 'APR number' field, afterwards transmit with <F2>. The source data set does not change.
To move an APR data set copy a data set to the desired destination and delete the source APR data set afterwards with ‘APR deassign'.

There has to be an active destination APR. Error 00BR will come up if a data set is loaded/ copied to an APR number which is not assigned to any RGDV.
If APR backups are reloaded the APR numbers of the backup file will be the same after reloading except
- if the APR numbers are already occupied
- if a default data set from the installation disk is used
- if an individual RGDV backup file will be loaded to another RGDV of the same generator.

# Note

'APR number's should not be changed if the generator is in combination with a BuckyTH or TH2 system via CAN.

Otherwise the assignment of APR#s for the control handle will be lost.

[P] APR name: 16 characters are possible

If special letters are needed (language dependent) see doc INSTALLATION character codes.

# Note

Since Bucky controller release 5.x for BuckyTH2 an "=" character must be at the end of the APR name string to get a ready display for grid used RGDV / APR.

APR for RGDVs 1+2+3 with Inalfa trays must always have the "=".
APR for ACL4 trays with removable grid must have the "=" when the grid shall be used
and no "=" when the grid shall not be used (removed from the tray to get a system ready) for application reasons.
Digital Diagnost systems also require the "=" character for a system ready when the grid shall be used and no "=" without grid.

If APR data are changed at the desk the two last digits of the 16 character field will be used to indicate '_*' = 'overriding'.

Example: [infant 10-15 yrs] will change to [infant 10-15 y_*] after overriding.

Focus: small = small filament of the tube

middle = (in case of a 3 focal spot tube, not yet available)

large = large filament of the tube

vario = is a virtual focal spot, its size (tube type dependent) in-between large and small focus can be selected via the 'Vario focus ratio',
only with RO17/50, SRO09/51, SRO25/50, SRO33/100 tubes with superimposed focal spots and if option is present

[P] Vario focus ratio:

range: 20%, 35%, 50% (default) , 65%, 80% of small focus

Sets the ratio of small and large focus, for tubes with superimposed focal spots.
If possible indicate the ratio in the 'APR name' field.
Example: 'Thorax_ap____50%'
To get the best application exposure parameters use APRMANager, it takes the tube current limits into account and calculates the optimum.

([P]) Dose measurement field (left): on / off

Dose measurement field (middle): on / off

Dose measurement field (right): on / off

At least one of the measuring fields must be 'on' to have access to AEC, AECF or TDC no matter if the 'Preferred technique' is set to Automatic' or 'Non automatic'.
A chamber must be programmed at 'RGDVx Data Set A' + 'Dose measurement input'.
The default APR data set [### APR name ###] has all 3 fields 'on'.
Some customers like ho have technique APR's only. If so switch 'off' all fields for the non-AEC techniques so that there is no way to change to AEC technique if AEC is possible at the same RGDV / menu / page.
If a Mobile Cassette Stand MCS is used at RGDV4 together with free cassette of a BuckyTH, TH2 system the APR/menu structure should offer free cassette APR with all fields off and
MCS APR with the required field(s) on.

[P] Preferred technique:

#### Non automatic

One of the three 'No AEC technique’s will be displayed at the major exposure data display.
With the mA-s labeled button at the desk one can switch over from kV-mA-ms (LED on) to either kV-mAs or kV-mAs-ms technique (LED off), depending on what has been programmed.
If a 'Dose measurement input' and/or ‘Dose measurement sensor type’ is programmed at 'RGDVx Data Set A' and at least one 'dose measurement field' is 'on' one can switch over to AEC technique, which will cause the overriding sign ' _*' coming up.

#### Automatic

AEC / AECF / TDC technique will appear when this APR is selected (AEC technique button LED and 1...3 measuring field LED's on).

# Note

Most of the predefined APR data sets from the installation disk are programmed for a 400 speed system (Recommended Dose: 2.5 µGy). If these are taken all organ dependent mAs values have to be adapted to the local film speed systems (doubled for 200 speed systems, divided by 2 for 800 speed systems).

[P] AEC technique:

AEC falling load kV the kV dependent mA start value of the falling load exposure will appear in the 'Exposure data I [mA]' field

AEC fixed current kV-mA the fixed mA value has to programmed in the
'Exposure data I [mA]' field, mA and exposure time values have to match the required organ dependent mAs

Select kV-mA-ms (RUIT) at 'No AEC technique'

TDC (Tomo Density Control) (option 9890 000 0223x, see STAMMKARTE)

the TDC start mA value has to be programmed in the 'Exposure data I [mA]' field
or
the desired mAs value in the 'Exposure data Q [mAs]:' field in combination with the tomo sweep time = 'Exposure data t [ms]:'

Select ‘kV-mA-ms (RUIT)’ or ‘kV-mAs-ms (RUQT)’ at 'No AEC technique'

[P] No AEC technique: = all non-Amplimat techniques

Two out of the three 'No AEC technique's are available for every APR.

If either kV-mAs or kV-mAs-ms technique is selected one can switch over to kV-mA-ms technique pushing the "mA-s" labeled button at the desk.
If kV-mA-ms (LED on) is programmed as preferred non-AEC technique and if it will be deselected by pushing the "mA-s" labeled button (LED off) it changes to kV-mAs technique only.
The preferred 'No AEC technique' after AEC-deselect can be changed at the control desk with the overriding-save function.

If kV-mAs-ms technique is programmed as preferred non-AEC technique it will change to kV-mAs if the APR data set has been modified at the control desk and has been saved with kV-mA-ms technique selected (only at non-tomo RGDV)

kV-mA-ms technique (RUIT) (Radiographic kV-mA-s), choice of kV, mA and ms parameters

Must be selected in case of 'AEC fixed current kV-mA' as preferred AEC technique and can be selected for 'TDC (Tomo Density Control)' techniques.

kV-mAs technique (RUQ) Radiographic kV-mAs, choice of kV and mAs parameters

kV-mAs-ms technique (RUQT) Radiographic kV-mAs-s, choice of kV, mAs and ms parameters

Should be selected as the best non-AEC technique for TDC technique APR.

This technique is very helpful at simple tomography stands (e.g. replacement, no chamber for TDC). Exposure time and mAs can be selected individually depending on the tomo sweep time and the organ & patient size, but:
Time +/- selection is not possible if RGDV is programmed 'Used for tomo = yes' at 'RGDVx Data Set B'. It must be programmed in the APR or the time selection is controlled by automatic input of tomo times (decade WAX21 or Bucky controller).

# Note

Depending on which of the three non-AEC techniques is selected only the relevant parameters in the following 'Exposure data nn [xx]' have to be modified. All other parameters will be calculated by the generator itself after transmission with <F2>. If the same APR data set screen will be called again, the calculated "slave values" appear.

Most of the predefined APR data sets from the installation disk are programmed for a 400 speed system (Recommended Dose: 2.5 µGy). If these are taken all organ dependent mAs values have to be adapted to the local film speed systems (doubled for 200 speed systems, divided by 2 for 800 speed systems).

[P] Tube current max. factor [%]

range = 1...100% (default 100 %)

The max emission current can be modified within the above range.
The reduced current (see 'Exposure data I [mA]') will be the start mA value of an AEC falling load exposure. It can also be the max mA value e.g. for an AEC fixed current exposure. It will be a constant value during the exposure until it comes to a point where the mA have to be reduced (falling load) within 4000ms. The mA value as the result of the % reduction is different for each kV value.

The mA value can be seen if the APR data set screen has been transmitted with <F2> once. Call the same ‘Change APR’ data set again and the calculated mA value appears.
Another way to see the mA is at the desk: Push the APR button, switch off AEC. The background technique will come up. In case of kV-mAs or kV-mAs-s push the "mA-s" labeled button to switch over to kV-mA-ms technique. The displayed mA is the value which is one step below the max value in the row of the programmed mA steps (see 'RGDVx Data Set B'). Now push the +mA button to get the max mA value. This is identical to the data set displayed on the PC screen.
If an APR with small focus will be changed by pushing the large focus button the +mA has to be pushed until the max value appears. A change from large to small will immediately display the max mA.

The modification of the max factor will lead error 00L$ if the resulting mAs value is below 0.5 mAs.Take care that there are not too many additional reductions programmed

[P] PSC U thin (dose equivalent steps): range = 0...-5 dose equiv. kV steps

Patients Size Correction kV slim patient

[P] PSC U thick (dose equivalent steps): range = 0...+5 dose equiv. kV steps

Patients Size Correction kV thick patient

[P] PSC Q thin (6% steps): range = 0...-10 mAs steps see Steps

Patients Size Correction mAs slim patient

[P] PSC Q thick (6% steps): range = 0...+10 mAs steps see Steps

Patients Size Correction mAs thick patient

[P] PSC density thin (6% steps): range = 0...-10 dens. steps see Steps

Patients Size Correction density correction slim patient, max limit possible = - 8 steps

[P] PSC density thick (6% steps): range = 0...+10 dens. steps see Steps

Patients Size Correction density correction thick patient, max limit possible = + 8 steps

Exposure data U [kV]: range = 40...150 kV or what has been programmed at 'Tube limits'

If full kV range is not available, check ‘Tube limit’ settings.

Exposure data I [mA]: range = 0.1...2000 mA

Depending on the generator version, tube type, focal spot, selected technique and all reduction factors: This value can be a master or slave value.

The result of a [mA]*[ms] multiplication must always be >= 0.5 mAs, otherwise error 00L$ appears.

If full mA range is not available, check ‘Tube limit’ settings or all other reduction tables.

Exposure data Q [mAs]: range = 0.5...1000 mAs (generally limited at 850 mAs)

Depending on the tube type, focal spot, selected technique and all reduction factors:
This value can be a master or slave value.

If full mAs range is not available, check ‘Tube limit’ settings or all other reduction tables.

Exposure data t [ms]: range = 1...16000 ms

Depending on the tube type, focal spot, selected technique and all reduction factors:
This value can be a master or slave value.

The result of a [mA]*[ms] multiplication must always be >= 0.5 mAs, otherwise error 00L$ appears.

If full range is not available, check ‘Tube limit’ settings or all other reduction tables.

Exposure data density (6% steps): range = -8...+8 density steps at 6%

Depending on which step rate has been programmed at 'RGDV Data Set B',

explanation see steps

*** If APR with AEC are associated to a certain Film-Screen-Combination the basic density value of the FSC appears as a zero. This zero - value is the base density value which has been adjusted to the customers taste.

There are organs which work fine with the basic zero density, but others require e.g. a zero-2 or zero+3 correction.
SCP and MedioCP are based on 12% steps for every +/-1 correction,
so should the Optimus be programmed at 'RGDVx Data Set B'. For every +/-1 12% step two +/-6% steps have to be programmed.

#### Film screen comb.:

Offers all available FSC names programmed to the 'Data Set's of a chamber assigned to the RGDV of the selected APR.

def 1 = default, no FSC programmed yet.

Since Release 3 predefined APR data sets can be programmed with the FSC name = ‘Abbreviation’. If the ‘Abbreviation’ string and the name in the APR data set is identical, the FSC will be associated to the APR data set.

If no name is given in the default APR data set the Recommended Dose µGy value of the individual APR data set will determine the assignment of the APR to the FSC Data Set which has the closest ‘Dose of FSC [µGy/V]’ value.

The Recommended Dose µGy value cannot be seen in this screen via AGent2 It is only possible with the APRMANager.

*** Most of the predefined APR data sets from the installation disk are programmed for a 400 speed system (Recommended Dose: 2.5 µGy). If these are taken all organ dependent mAs values have to be adapted to the local film speed systems (doubled for 200 speed systems, divided by 2 for 800 speed systems).

#### [P] Tomo Number:

1 = default

1...8 = via ‘Release circuit adaptation unit’ 1WA or 2WA

1...16 = ‘Bucky Ctrl. 1/Dig. Diag.’ Bucky TH / TH2 and Digital Diagnost via CAN

Option Automatic Input of Tomo Times 9890 000 0222x (see STAMMKARTE) must be present. If no tomo unit is present: ignore.

Decade systems:

Active if programmed at 'RGDVx Data Set A + B', 'RGDV Interface Assignments' and 'Tomo Time' for the programmed 'Release circuit adaptation unit'. Then 8 tomo numbers are available for non-CAN systems.

*** If tomo APRT's are programmed using option Automatic input of tomo times: Select every APRT once. For a very short time the default time of an APRT can be seen at the desk, then the tomo time contact might override the default time. This time must be saved using the desk save function: push and hold the RESET labeled button + active APRT.
Now the programmed tomo time 1...8 is copied and saved at the APRT data set. If it is not saved then the default APRT time will come up again if the APRT is pushed a second time or if an APRT with the same tomo time is selected.
The tomo time input only reacts to a high >> low transition of the time contact input.
- If tomo is programmed at 'RGDV Data Set A + B' it is not possible to change the exposure time at the desk. If APRT with the same tomo trajectory have to be corrected time dependent then an APRT with another tomo trajectory has to be selected. Afterwards select the APRT which has to be modified to get the high >> low time input response.
- It might happen that three tomo times can be seen at the desk after pushing an APRT button: At first the APR time is displayed. The second time might be tomo time number 1, as long as all time input contacts of the tomo stand are open. If then any tomo time contact is closed, the status change will cause the display of the programmed tomo time

#### CAN systems:

Active if programmed at 'RGDVx Data Set A + B' for CAN systems:

Bucky TH, TH2, Digital Diagnost ("<" marked not for DiDi) systems with TOMO option provide 16 tomo sweeps:

tomo # | sweep | tomo # | sweep
Bucky | Optimus | Bucky | Optimus
0 | 1 | 8º / 0.8s | 8 | 9 | 30º / 1s
1 | 2 | 8º / 1s | 9 | 10 | 30º / 2s
2 | 3 | 8º / 2s | 10< | 11< | 30º / 3s
3 | 4 | 20º / 0.8s | 11< | 12< | 30º / 4s
4 | 5 | 20º / 1s | 12 | 13 | 40º / 1.2s
5 | 6 | 20º / 2s | 13 | 14 | 40º / 2s
6< | 7< | 20º / 3s | 14< | 15< | 40º / 3s
7 | 8 | 30º / 0.8s | 15< | 16< | 40º / 4s

#### Tomo via Bucky controller:

If the default programmed tomo times in the APR data set are different to the tomo times sent by the bucky system the default APR time appears for a very short moment, then the time will be overridden by the controller message. If so, use the save function of the desk to save the proper tomo time in the APR data set.

[P] Spectral Filter:

Gives a selection of the three filter types of the GALILEO collimator BuckyTH, TH2, Digital Diagnost, Thoravision:

no filter

2 mm AL

0.1 mm CU + 1 mm Al

0.2 mm CU + 1 mm Al

[P] Fluoroscopy curve:

One out of the 20 ‘Fluoroscopy curves’ (the ones which have been loaded with default data sets can) be selected.