Validation of CT doses of SPECT/CT and PET/CT hybrid devices: Lessons learned

Terez Sera, Tamas Porubszky, Miklos Papos, Richard Elek, Zsuzsanna Besenyi, Katalin Gion, Andras Bartha, Sandor Pellet, Laszlo Pavics

Research output: Contribution to journalArticle

3 Citations (Scopus)


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 CTDI vol 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.

Original languageEnglish
Pages (from-to)534-538
Number of pages5
JournalNuclear medicine communications
Issue number5
Publication statusPublished - May 2014


  • CT doses
  • CTDI
  • SPECT/CT and PET/CT hybrid devices
  • Whole-body and head phantoms

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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    Sera, T., Porubszky, T., Papos, M., Elek, R., Besenyi, Z., Gion, K., Bartha, A., Pellet, S., & Pavics, L. (2014). Validation of CT doses of SPECT/CT and PET/CT hybrid devices: Lessons learned. Nuclear medicine communications, 35(5), 534-538.