POSTER SECTIONS Coverpage Aims and objectives Methods and materials Results Conclusion Personal information References

ECR 2015 / C-1781

Orthopantomography in pediatric age: a preliminary dosimetric and epidemiologic assessment

This poster is published under an open license. Please read the disclaimer for further details.

Congress:

ECR 2015

Poster Number:

C-1781

Type:

Scientific Exhibit

Keywords:

Radioprotection / Radiation dose, Paediatric, Head and neck, Conventional radiography, Radiation safety, Diagnostic procedure

Authors:

F. Testa¹, M. Parodi², E. Fumero¹, E. Roberto³, S. Chauvie³, R. Olivero¹, M. Baigi¹, N. Angaramo¹, D. Fraire¹; ¹Bra/IT, ²Alba/IT, ³Cuneo/IT

DOI:

10.1594/ecr2015/C-1781

DOI-Link:

https://dx.doi.org/10.1594/ecr2015/C-1781

Fig. 1: The Planmeca ProMax 3D unit installed at our Department

Fig. 7: The anthropomorphic phantom Adelson Rando is centered into the Planmeca Promax...

Fig. 8: Monte Carlo simulation by PCXMC software (Stuk).

Fig. 3: The touch screen control panel of the unit showing general parameters of...

Fig. 5: Preset radiologic parameters (kV and mA) can be adjusted by the operator.

Fig. 2: The cesium iodide semiconductor flat-panel detector (with direct conversion of...

Fig. 4: SmartPan software generates a series of 9 panoramic curves with a step of 2 mm....

Fig. 6: Ionization chamber Unfors Xi is placed onto the flat panel digital detector of...

Methods and materials

A new all-digital device for dental radiology (Planmeca ProMax 3D) has been installed in our radiology Department, serving a public local health service of about 170,000 people.

Fig. 1: The Planmeca ProMax 3D unit installed at our Department

This unit performs dental and maxillo-facial acquisitions by a cesium iodide semiconductor flat-panel detector (with direct conversion of the X-Ray signal).

Fig. 2: The cesium iodide semiconductor flat-panel detector (with direct conversion of the X-Ray signal) of the Planmeca ProMax 3D unit.

To perform an orthopantomography it is provided with a program named "SmartPan". This software makes a pulsed acquisition of 200° around the head of the patient.

Fig. 3: The touch screen control panel of the unit showing general parameters of SmartPan acquisition.

The further elaboration reformats raw data into a set of 9 curved images with a step of 2 mm, to select as final image the best focused in all regions one.

Fig. 4: SmartPan software generates a series of 9 panoramic curves with a step of 2 mm. The operator can choose the image best focused in all regions.

There are a wide series of presets of radiological parameters (kV and mA) according to the size of the patient and the resolution of the imaging. All this parameters can be manually adjusted by the operator.

Fig. 5: Preset radiologic parameters (kV and mA) can be adjusted by the operator.

We made a quality control by a ionization chamber (Unfors Xi), to assess the exact correspondance between set parameters and the real X-Ray beam.

Fig. 6: Ionization chamber Unfors Xi is placed onto the flat panel digital detector of the Planmeca Promax 3D to get a quality assessment of radiological data.

We performed dosimetric evaluations by an anthropomorphic phantom (Adelson Rando) similar to an average male subject of 175 cm and 73.5 kg. We made on it several acquisitions according to the standard facial protocols.

Fig. 7: The anthropomorphic phantom Adelson Rando is centered into the Planmeca Promax 3D unit.

To estimate effective doses we used a PC-based Monte Carlo program (PCXMC).

Fig. 8: Monte Carlo simulation by PCXMC software (Stuk).

We retrieved data from the first-nine-months worklists of Planmeca ProMax 3D to extract all pediatric patients 4-12 y/o undergone orthopantomography.

We made some queries on local databases to intercept - as well as it was possible - young patients studied elsewhere.