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"Flying Through" and "Flying Around" a PET/CT Scan: Pilot Study and Development of 3D Integrated ¹⁸F-FDG PET/CT for Virtual Bronchoscopy and Colonoscopy

Molecular Imaging Program at Stanford, Departments of Radiology and Bioengineering, Stanford University, Stanford, California

Correspondence: For correspondence or reprints, contact either of the following: Andrew Quon, MD, Stanford University School of Medicine, 300 Pasteur Dr., Room H-0101, Stanford, CA 94305-5281. E-mail: aquon{at}stanford.edu; Sanjiv S. Gambhir, MD, PhD, Stanford University School of Medicine, 318 Campus Dr., Room E150A, Stanford, CA 94305-5427. E-mail: sgambhir{at}stanford.edu

The objective of this pilot project was to devise a new image acquisition and processing technique to produce PET/CT images rendered in 3-dimensional (3D) volume that can then be reviewed in several 3D formats such as virtual bronchoscopy and colonoscopy "fly-throughs" and external "fly-arounds." Methods: We tested the new imaging and processing protocol on 24 patients with various malignancies to determine whether it could dependably acquire and reformat standard tomographic 2-dimensional PET/CT images into 3D renderings. Results: This new technique added helpful information to the diagnostic interpretation for 2 of the 24 patients. Further, in the 6 patients undergoing mediastinoscopy, bronchoscopy, or endoscopy, 3D imaging helped in preprocedural planning. Conclusion: In this initial study, we demonstrated both the feasibility of rendering PET/CT images into 3D volumes and the potential clinical utility of this technique for diagnostic lesion characterization and preprocedural planning.

Key Words: PET/CT • FDG • fusion • virtual colonoscopy • virtual bronchoscopy • colon cancer • lung cancer

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