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Use of respiratory gating in PET/CT imaging of lung nodules

¹ Nuclear Medicine, University Hospitals Case Medical Center, Cleveland, Ohio

2119

Objectives: Comparison of retrospective versus prospective reconstruction on respiratory gated PET/CT studies for minimizing respiratory motion artifact and improving small lesion detectability.

Methods: 10 Patients were injected with 9 to 12 mCi of F-18 FDG and were scanned on a 16 slice PET/CT time of flight scanner. After a 60 minute uptake period, patient were positioned and the respiratory bellows belt was attached to the patient’s abdomen or chest for detection of breathing pattern. Communicate to the patient that small, comfortable inspirations are ideal. A surview CT was acquired covering the maximum extent needed for the PET/CT. The surview CT was used to plan the CT localization series, the Retrospective or Prospective CT series and the PET emission series. The CT for localization and attenuation correction was acquired MaS of 150.Prospective CT is acquired in axial slices at end expiration (max exhale). The CT acquisition is only during the period max exhale and the PET acquisition is three minutes of data also acquired at max exhale. Retrospective gating is the use of longer CT acquisition thought out multiple respiratory cycles many respiratory. This is done by doing a gated spiral CT acquisition at max MaS of 150 with the PET acquisition identical to the Prospective technique.

Results: Prospective reconstruction was equal to retrospective reconstruction in quality, but prospective was accomplished with less radation exposure to the patient.

Conclusions: Artifacts may be present in the region of the diaphragm from standard PET/CT study due to the the near instantaneous acquistion of the CT attenuation scan and the motion of the diaphragm on the PET due to free breathing.Prospective respiratory gating improvesimage quality with less radiation exposure to the patient.

This Article Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Wojtylak, P. Articles by Ash, S. PubMed Articles by Wojtylak, P. Articles by Ash, S.