Validation of CT doses of SPECT/CT and PET/CT hybrid devices lessons learned /

Validation of CT doses of SPECT/CT and PET/CT hybrid devices: lessons learned Sera, Terez; Porubszky, Tamas; Papos, Miklos; Elek, Richard; Besenyi, Zsuzsanna; Gion, Katalin; Bartha, Andras; Pellet, Sandor; Pavics, Laszlo Abstract The aim of the study was to check the validity of computed tomographic...

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Bibliographic Details
Main Authors: Séra Teréz Emese
Porubszky Tamás
Papós Miklós
Elek Richárd
Besenyi Zsuzsanna
Becsyné Gion Katalin
Bartha András
Pellet Sándor
Pávics László
Format: Article
Published: 2014
Series:NUCLEAR MEDICINE COMMUNICATIONS 35 No. 5
Subjects:
doi:10.1097/MNM.0000000000000087

mtmt:2584888
Online Access:http://publicatio.bibl.u-szeged.hu/24198
Description
Summary:Validation of CT doses of SPECT/CT and PET/CT hybrid devices: lessons learned Sera, Terez; Porubszky, Tamas; Papos, Miklos; Elek, Richard; Besenyi, Zsuzsanna; Gion, Katalin; Bartha, Andras; Pellet, Sandor; Pavics, Laszlo Abstract The aim of the study was to check the validity of computed tomographic (CT) doses exhibited by SPECT/CT and PET/CT hybrid devices. Dose measurements were taken from four SPECT/CT and four PET/CT cameras commercially available from different manufacturers. A calibrated ionization chamber was placed in whole-body or head phantoms for the acquisition of CT images with clinically used parameters. Computed tomography dose index (CTDIvol) values were calculated according to the IEC 60601-2-44:1999 formula. The measured CTDIvol doses were compared with those preprogrammed by the manufacturer. In the case of the whole-body phantom, the differences between the measured and displayed values varied between −31 and +24% [European document RP162 (2012) sets up the limit for acceptance criterion as ±20%]. The head phantom data showed either an agreement between −10 and +24%, or an underestimation by two-fold. The latter seemed to be because, while preprogramming the doses, the manufacturer had used the whole-body phantom instead of a proper head phantom. The results of the work demonstrate the need for individual dosimetric calibration of every single X-ray tube. Dosimetric checks should be included in the regular quality control programmes of the SPECT/CT and PET/CT devices. Special attention should be paid to head-and-neck and paediatric protocols, in which the use of a head phantom is recommended for dose calibration. © 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins
Physical Description:534-538
ISSN:0143-3636