KaVo ProXam Constancy Test DIN 6868-5EN Operating instructions

Brand: KaVo

Model: ProXam Constancy Test DIN 6868-5EN

Type: Operating instructions

KaVo ProXam Constancy Test DIN 6868-5EN

The KaVo ProXam Constancy Test DIN 6868-5EN is a device designed to perform constancy tests on KaVo ProXam 2D, 3D, and 3DQ X-ray units. This test is required by the X-ray Ordinance (Röntgenverordnung) to be carried out by the operator once a month to confirm image quality.

The device includes a 2D Quart Test Phantom Set, which is required for the test. The set includes a test phantom, frame assembly, copper plate assembly, copper filter, phantom holder, and cephalostat head support alignment plate.

KaVo ProXam Constancy Test DIN 6868-5EN

KaVo ProXam Extraoral systems

Instructions for use

Constancy test DIN 6868-5

The manufacturer, assembler and importer are responsible for the safety, reliability and

performance of the unit only if:

- installation, calibration, modification and repairs are carried out by qualified

authorised personnel

- electrical installations are carried out according to the appropriate requirements such

as IEC 60364

- equipment is used according to the operating instructions.

Planmeca pursues a policy of continual product development. Although every effort

is made to produce up-to-date product documentation this publication should not be

regarded as an infallible guide to current specifications. We reserve the right to make

changes without prior notice.

Publication Number 1.015.1559 Revision 1

Release Date 1 March 2023

Table of contents

1 Introduction.................................................................................................................................................1

2 Constancy test tools................................................................................................................................... 2

3 Preparing Romexis..................................................................................................................................... 3

4 Constancy test for panoramic imaging....................................................................................................... 4

4.1 Positioning test phantom................................................................................................................ 4

4.2 Positioning copper plate assembly and copper filter...................................................................... 5

4.3 Adjusting X-ray unit........................................................................................................................ 6

4.4 Taking test exposure...................................................................................................................... 6

4.5 Evaluating test results.................................................................................................................... 7

5 Constancy test for cephalometric imaging................................................................................................10

5.1 Positioning test phantom.............................................................................................................. 10

5.2 Positioning copper plate assembly...............................................................................................12

5.3 Cephalometric X-ray unit settings.................................................................................................13

5.4 Preparing test exposure............................................................................................................... 13

5.5 Evaluating test results.................................................................................................................. 14

Instructions for use Extraoral constancy test DIN 6868-5

Table of contents

Extraoral constancy test DIN 6868-5 Instructions for use

1 Introduction

These instructions describe how the constancy test is performed in

accordance with DIN 6868 Part 5 on KaVo ProXam 2D and 3D X-ray units.

These instructions apply to the following X-ray units:

• KaVo ProXam 2D

• KaVo ProXam 3D

• KaVo ProXam 3DQ

with or without cephalostat.

NOTE

Read these instructions thoroughly before performing the constancy test.

X-ray images of a Quart test phantom are prepared for the constancy

test. According to the X-ray Ordinance (Röntgenverordnung), the constancy

test must be carried out by the operator once a month to confirm image

quality. The test results determine whether the image generation meets

the legal requirements, i.e. if the quality of the image generation has

remained constant within the defined thresholds within the framework of the

acceptance test. These thresholds are defined in the appropriate acceptance

test protocols supplied with the device. The service technician who installs

the X-ray equipment is responsible for carrying out and documenting the

acceptance test.

The constancy test is carried out according to DIN 6868-5 “Image quality

assurance in diagnostic X-ray departments - Part 5: RöV constancy testing

of dental radiographic equipment” and the test exposure must be evaluated

according to the criteria defined therein.

To compare the constancy test exposure with the acceptance test exposure

(reference exposure) it is very important that all settings used for the image

acquisition and image processing remain constant.

The dialogue windows shown in these instructions only serve as examples

unless otherwise specified.

NOTE

The digital X-ray units and the image processing program have separate

manuals that should be used with these instructions.

Original manufacturer

PLANMECA OY

Asentajankatu 6 FIN-00880

Helsinki FINLAND

Phone: +358-20-7795 500

Distribution

KaVo Dental GmbH

Bismarckring 39

88400 Biberach

Germany

Phone +49 7351 56-0

Fax +49 7351 56-1488

1 Introduction

Instructions for use Extraoral constancy test DIN 6868-5 1

2 Constancy test tools

2D Quart Test Phantom Set (2.023.4050) is required for the DIN 6868-5

constancy test for KaVo ProXam 2D, 3D and 3DQ X-ray units. The set is

optional and available as a spare part.

NOTE

Handle the test phantom with care and do not drop it.

1Test phantom

2Frame assembly

3Copper plate assembly

4Copper filter

5Phantom holder

6Cephalostat head support alignment plate

2 Constancy test tools

2 Extraoral constancy test DIN 6868-5 Instructions for use

3 Preparing Romexis

Steps

1. New patient is set up by a service technician.

Images are filed based on patient's name. The patient must therefore be

selected before the exposure.

The service technician sets up a corresponding “patient” in the Romexis

program so that test exposures can be prepared. The acceptance test

exposure (reference exposure) created by the service technician will be

filed under this “patient”.

2. Select this patient from the patient list.

For more information on Romexis, refer to

Romexis user's manual

3 Preparing Romexis

Instructions for use Extraoral constancy test DIN 6868-5 3

4 Constancy test for panoramic imaging

4.1 Positioning test phantom

Steps

1. Pull the ring of the locking pin (1).

At the same time, push the holder assembly in the designated slot

in the frame assembly (2). Release the locking pin when the holder

assembly is in place (3). The holder assembly is now secured in the

frame assembly.

2. Place the test phantom in the frame assembly.

Ensure that the side with the offset rings is facing forward. Position the

test phantom so that the groove is facing upwards.

1Groove

2Frame assembly

3Quart test phantom

4Offset rings

3. Remove the head support from the positioning table and, if necessary,

remove the chin support or the chin rest from the adapter.

4 Constancy test for panoramic imaging

4 Extraoral constancy test DIN 6868-5 Instructions for use

4. Fit the frame assembly into the adapter as illustrated.

The test phantom must be positioned so that the side with the offset

rings is facing forwards.

1Adapter

2Frame assembly

3Holder assembly

4.2 Positioning copper plate assembly and copper filter

Steps

1. Secure the copper plate assembly (L-shaped) to the X-ray unit housing.

NOTE

Ensure that the copper plate assembly is roughly in the middle of the

X-ray unit housing (as shown).

4 Constancy test for panoramic imaging

Instructions for use Extraoral constancy test DIN 6868-5 5

2. Then, as shown, position the copper filter onto the L-shaped copper

plate assembly you have just secured.

4.3 Adjusting X-ray unit

Use the exposure values (kV, mA) and device settings (program type,

patient size) set during the acceptance test.

The acceptance test is documented by the service technician and the

exposure values and device settings used in the acceptance test are

recorded in the form

Acceptance test for dental radiographic equipment

The exposure values are also entered in the form

Constancy test for

panoramic and teleradiographic systems in dental radiology

Precise instructions on the use of the X-ray equipment are set out in the

manual.

4.4 Taking test exposure

Steps

1. In the Romexis, right-click on the Patient for the test exposure from the

patient list.

2. Select Capture followed by Pan Exp.

3. When the system is ready to use, press the exposure button and hold it

down throughout the exposure.

Follow the instructions in the X-ray unit user's instructions.

4 Constancy test for panoramic imaging

6 Extraoral constancy test DIN 6868-5 Instructions for use

4. Click on the ready button at the bottom of the window of the Romexis to

accept the new exposure.

5. Select the Display properties option and name the exposure in the

Comments field.

This name differentiates the new test exposure from the other test

exposures to be performed later on. The information is stored with the

image and displayed as reference text.

6. Click Set Layout on the top toolbar.

7. Select the middle option.

If the test exposures are arranged next to each other on the screen, it

is easier to compare the new constancy exposures with the reference

exposure (taking the exposure test).

For more information on Romexis, refer to the

Romexis user's manual

NOTE

To compare the constancy test exposure with the acceptance test

exposure (reference exposure) it is very important that all settings used

for the image acquisition and image processing remain constant.

4.5 Evaluating test results

The test exposure must be compared with the X-rays taken during the

acceptance test and any deviations from the baseline must be checked.

The acceptance test was recorded by the service technician and the test

results are documented in the form

Acceptance test for dental radiographic

equipment

. These test results are treated as reference values for the

constancy test exposure that has now been created and are also entered

in the form

Constancy test for panoramic and teleradiographic systems in

dental radiology

The results of the constancy test exposure must be recorded separately. The

form

Constancy test for panoramic and teleradiographic systems in dental

radiology

is also used to record the test results of the constancy tests.

4 Constancy test for panoramic imaging

Instructions for use Extraoral constancy test DIN 6868-5 7

The results of the constancy tests must be entered in the table in the form

every month. The form has completed tables for the first year; after this,

you can attach a supplementary sheet with a corresponding table from your

X-ray unit book. Or alternatively you can simply copy the empty form if you

need to.

NOTE

Constancy test exposures and documents must be archived for two years.

NOTE

If there are any deviations from the baseline (reference exposure), it is

important that you immediately contact your service technician.

The constancy test exposure is to be evaluated in terms of the following.

1Minimum resolution: 2.5 Lp/mm

2Minimum contrast: 2 of the 4 elements

•Visual resolution capacity

The visual resolution capacity is tested with the aid of a lead line test

pattern. The monitor image of the panoramic test exposure must have a

minimum resolution of 2.5 line pairs/mm.

•Minimum contrast:

The minimum contrast is defined with the aid of low contrast elements

(drill holes). At least two of the four low contrast elements must be

detectable on the monitor screen of the panoramic test exposure.

•Area of effective radiation

4 Constancy test for panoramic imaging

8 Extraoral constancy test DIN 6868-5 Instructions for use

The constancy of the position of the area of effective radiation is shown

on the monitor image of the panoramic test exposure. At least one

unexposed edge (1) must be detectable on two opposite sides.

The imaging plate technology must have an unexposed edge all the way

round.

The following also applies to units with imaging plates.

•Uniformity of the procedure

The uniformity of the procedure is established based on the monitor

image of the panoramic test exposure. The horizontal stripes generated

by the image must be parallel. No radial run-out of the moving

mechanism may be evident.

4 Constancy test for panoramic imaging

Instructions for use Extraoral constancy test DIN 6868-5 9

5 Constancy test for cephalometric imaging

5.1 Positioning test phantom

Steps

1. Pull the ring of the locking pin (1).

At the same time, push the cephalostat head support alignment plate

(2) in the designated slot on the frame assembly as shown. Release

the locking pin when the cephalostat head support alignment plate is in

place (3). The positioning aid is now secured in the holder.

2. Place the test phantom in the frame assembly.

Position the test phantom as shown below.

1Test phantom

2Large slot

5 Constancy test for cephalometric imaging

10 Extraoral constancy test DIN 6868-5 Instructions for use

3. Turn the head support plate to the 0° position.

4. Open the release tabs and remove both ear posts and the nasal

positioner from the cephalometric X-ray unit.

5. Push the cephalostat head support alignment plate (1) into the mounting

part for the right ear post (on the sensor side) and close the release tab.

The test phantom must be positioned so that the side with the offset

rings is facing the sensor (3).

Ensure that the fixture is secure.

5 Constancy test for cephalometric imaging

Instructions for use Extraoral constancy test DIN 6868-5 11

1Cephalostat head support alignment plate

2Test phantom

3Sensor

4Cephalostat

5.2 Positioning copper plate assembly

Steps

1. Secure the copper plate assembly on the X-ray unit housing (if you have

not yet done this).

NOTE

Ensure that the copper plate assembly is roughly in the middle of the

X-ray unit housing (as shown).

NOTE

The copper filter is NOT used for cephalometric exposures.

5 Constancy test for cephalometric imaging

12 Extraoral constancy test DIN 6868-5 Instructions for use

5.3 Cephalometric X-ray unit settings

Use the exposure values (kV, mA) and device settings (program type,

patient size) set during the acceptance test.

The acceptance test is documented by the service technician and the

exposure values and device settings used in the acceptance test are

recorded in the form

Acceptance test for dental radiographic equipment

The exposure values are also entered in the form

Constancy test for

panoramic and teleradiographic systems in dental radiology

Precise instructions on the use of the X-ray equipment are set out in the

manual.

5.4 Preparing test exposure

Steps

1. In the Romexis, right-click on the Patient for the test exposure from the

patient list.

2. Select Capture followed by Ceph Exp.

3. When the system is ready to use, press the release button and hold it

down throughout the exposure.

Follow the instructions in the user's manual for the cephalometric unit.

4. Click on the ready button at the bottom of the window of the Romexis to

accept the new exposure.

5. Select the Display properties option and name the exposure in the

Comments field.

This name differentiates the new test exposure from the other test

exposures to be performed later on (e.g. constancy Pano June 2021).

The information is stored with the image and displayed as reference text.

6. Click Set Layout on the top toolbar.

5 Constancy test for cephalometric imaging

Instructions for use Extraoral constancy test DIN 6868-5 13

7. Select the middle option.

If the test exposures are arranged next to each other on the screen, it

is easier to compare the new constancy exposures with the reference

exposure (taking the exposure test).

For more information on Romexis, refer to the

Romexis user's manual

NOTE

To compare the constancy test exposure with the acceptance test

exposure (reference exposure) it is very important that all settings used

for the image acquisition and image processing remain constant.

5.5 Evaluating test results

The test exposure must be compared with the X-rays taken during the

acceptance test and any deviations from the baseline must be checked.

The acceptance test was recorded by the service technician and the test

results are documented in the form

Acceptance test for dental radiographic

equipment

. These test results are treated as reference values for the

constancy test exposure that has now been created and are also entered

in the form

Constancy test for panoramic and teleradiographic systems in

dental radiology

The test results of the constancy test exposure must be recorded separately.

The form

Constancy test for panoramic and teleradiographic systems in

dental radiology

is also used to record the test results of the constancy tests.

The results of the constancy tests must be entered in the table in the form

every month. The form has completed tables for the first year; after this,

you can attach a supplementary sheet with a corresponding table from your

X-ray unit book. Or alternatively you can simply copy the empty form if you

need to.

NOTE

Constancy test exposures and documents must be archived for two years.

NOTE

If there are any deviations from the baseline (reference exposure), it is

important that you immediately contact your service technician.

5 Constancy test for cephalometric imaging

14 Extraoral constancy test DIN 6868-5 Instructions for use

The constancy test exposure is to be evaluated in terms of the following

points.

1Minimum resolution: 2.5 Lp/mm

2Minimum contrast: 1 of the 4 elements

•Visual resolution capacity

The visual resolution capacity is tested with the aid of a lead line test

pattern. The monitor image of the cephalometric test exposure must

have a minimum resolution of 2.5 line pairs/mm.

•Minimum contrast

The minimum contrast is defined with the aid of low contrast elements

(drill holes). At least one of the four low contrast elements must be

detectable in the monitor image of the cephalometric test exposure.

•Area of effective radiation:

The constancy of the position of the area of effective radiation is shown

on the monitor image of the cephalometric test exposure. At least one

unexposed edge (1) must be detectable on two opposite sides.

For cephalometric X-ray systems with imaging plates, the edge

surrounding the three sides must be clearly shown if using soft tissue

filters.

5 Constancy test for cephalometric imaging

Instructions for use Extraoral constancy test DIN 6868-5 15

The following also applies to cephalometric X-ray systems with imaging

plates.

•Uniformity of the procedure

The uniformity of the procedure is established based on the monitor

image of the cephalometric test exposure. The horizontal stripes

generated by the image must be parallel. No radial run-out of the moving

mechanism may be evident.

5 Constancy test for cephalometric imaging

16 Extraoral constancy test DIN 6868-5 Instructions for use

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KaVo ProXam Constancy Test DIN 6868-5EN Operating instructions

Brand: KaVo

Model: ProXam Constancy Test DIN 6868-5EN

Type: Operating instructions

KaVo ProXam Constancy Test DIN 6868-5EN

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KaVo ProXam Constancy Test DIN 6868-5EN Operating instructions

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