KaVo ProXam Intraoral systems - Constancy test DIN 6868-5 Operating instructions

Brand: KaVo

Model: ProXam Intraoral systems - Constancy test DIN 6868-5

Type: Operating instructions

KaVo ProXam Intraoral 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 1.015.1545 Revision 1

Release Date 1 March 2023

Table of contents

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

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

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

4 Performing constancy test.......................................................................................................................... 4

4.1 Positioning sensor.......................................................................................................................... 4

4.2 Positioning imaging plate................................................................................................................5

4.3 Positioning cone............................................................................................................................. 6

4.4 Adjusting X-ray unit........................................................................................................................ 7

4.5 Taking test exposure...................................................................................................................... 7

5 Evaluating test results...............................................................................................................................10

Instructions for use Intraoral constancy test DIN6868-5

Table of contents

Intraoral constancy test DIN6868-5 Instructions for use

1 Introduction

These instructions describe how to perform the constancy test in accordance

with DIN 6868-5 on KaVo intraoral X-ray systems.

These instructions apply to the following:

• KaVo ProXam iX intraoral X-ray unit

• KaVo ProXam iS digital sensor

• KaVo ProXam iP imaging plate scanner

NOTE

Read these instructions thoroughly before performing the constancy test.

The X-ray images of a 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 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 Intraoral constancy test DIN6868-5 1

2 Constancy test tools

Quart Set for KaVo ProXam iS/ProXam iP (2.023.3003) is required for the

constancy test. The test phantom is optional and available as a spare part.

NOTE

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

1Test phantom

2Groove

3Slot for the digital sensor or the imaging plate (under the groove)

2 Constancy test tools

2 Intraoral constancy test DIN6868-5 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 Intraoral constancy test DIN6868-5 3

4 Performing constancy test

4.1 Positioning sensor

The constancy tests must be performed with the Quart test phantom, sensor

and cone which have already been used by the service technician for the

acceptance test. The information on this is available in the corresponding

acceptance test protocol supplied with the device (form

Acceptance Test

Push the sensor into the large slot of the test phantom (under the groove) as

shown.

1Test phantom

2Groove

3Sensor: Active surface facing up

• The active surface of the sensor must face upwards (cable on the back).

• The sensor must be inserted so that it is aligned on the right; this

ensures that the sensor is positioned so that all contrast elements of

the test phantom are imaged.

NOTE

Handle the sensor cable with care. The cable is sensitive and must not be

bent.

NOTE

The sensor must be positioned in the same way for every test exposure.

4 Performing constancy test

4 Intraoral constancy test DIN6868-5 Instructions for use

4.2 Positioning imaging plate

Steps

1. Push the imaging plate into a light protection cover.

Ensure that the active surface (blue side) of the imaging plate is facing

the black side (without text) of the light protection cover.

2. Remove the adhesive strip and seal the light protection cover.

NOTE

Handle the imaging plate with care. Do not twist or bend the plate. Do

not touch the active surface (blue side), as this can damage the imaging

plate. Protect the plates from light exposure.

4 Performing constancy test

Instructions for use Intraoral constancy test DIN6868-5 5

3. Push the light protection cover into the large slot of the Quart test

phantom (under the groove) as shown.

1Test phantom

2Groove

3Imaging plate with light protection cover

• The black side (without text) of the light protection cover must be

facing up.

• The light protection cover must be inserted so that it is aligned on

the right; this ensures that the imaging plate is positioned so that all

contrast elements of the test phantom are imaged.

NOTE

The imaging plate must be positioned in the same way for every test

exposure.

4.3 Positioning cone

Steps

1. Use the long cone for the test exposures.

The long cone has two positioning marks: one black and one red dot;

the cone is properly secured when the black dot is in line with the X-ray

unit's red dot.

NOTE

The test exposures must always be performed with the same equipment.

4 Performing constancy test

6 Intraoral constancy test DIN6868-5 Instructions for use

2. Position the cone as shown below.

1X-ray unit

2Long cone

3Test phantom

4Sensor/imaging plate

5Correct positioning

• Place the test phantom (3) on a flat surface.

• Position the cone of the X-ray unit (1) vertically on the test phantom.

• The central X-ray beam must be perpendicular to the test phantom.

• The cone must be positioned so that the entire sensor or imaging

plate is within the radiation field.

The cone may therefore NOT be placed in the centre of the test

phantom using the centring ring, as the lower part of the sensor or

the imaging plate are not exposed in this case.

NOTE

The cone and the test phantom must be in contact before every

exposure and must always be positioned in the same way.

4.4 Adjusting X-ray unit

The constancy tests must be performed with the device settings which are

already used by the service technician for the acceptance test, refer to the

section

Initial status for the acceptance/constancy test

(form

Acceptance

test

) for details.

Detailed instructions on the use of the X-ray unit are available in the manual

supplied with the unit.

4.5 Taking test exposure

Steps

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

patient list.

4 Performing constancy test

Instructions for use Intraoral constancy test DIN6868-5 7

2. Select Capture.

• For sensors, select the intraoral exposure.

• For imaging plates, select scanner exposure.

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

down throughout the exposure.

Follow the instructions in the manual supplied with the X-ray unit.

4. Move the imaging plate to the scanner.

4.a. Remove the light protection cover from the test phantom.

4.b. Open the light protection cover by removing the upper part.

4.c. Carefully place the imaging plate on the tray table of the imaging

plate scanner.

The active surface (blue side) of the imaging plate must face

upwards as shown.

4.d. Close the tray table.

The imaging plate is automatically scanned and the image

appears in the Romexis.

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

accept the new exposure.

6. Click Set Layout on the top toolbar.

4 Performing constancy test

8 Intraoral constancy test DIN6868-5 Instructions for use

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 Performing constancy test

Instructions for use Intraoral constancy test DIN6868-5 9

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 initial status was documented by the service technician and the test

results of the acceptance test are recorded in the form

Acceptance test

. The

results established here also serve as reference values for the constancy

test exposure created here.

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

The form

Constancy test

supplied with the unit is 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.

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

points:

• Visual resolution capacity:

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

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

resolution of 5 line pairs/mm.

• Minimum contrast:

5 Evaluating test results

10 Intraoral constancy test DIN6868-5 Instructions for use

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

(drill holes). All four low contrast elements must be detectable on the

monitor screen of the test exposure.

5 Evaluating test results

Instructions for use Intraoral constancy test DIN6868-5 11

KaVo Dental GmbH | Bismarckring 39 | 88400 Biberach | Deutschland

www.kavo.com

1.015.1545

KaVo ProXam Intraoral systems - Constancy test DIN 6868-5 Operating instructions

KaVo ProXam Intraoral systems - Constancy test DIN 6868-5 Operating instructions

KaVo ProXam Intraoral systems - Constancy test DIN 6868-5 Operating instructions

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