A randomized, double-blind, crossover comparison of novel continuous bed motion versus traditional bed position whole-body PET/CT imaging

• Published in: European journal of nuclear medicine and molecular imaging Vol. 43; no. 4; pp. 711 - 717
• Main Authors: Schatka, Imke, Weiberg, Desiree, Reichelt, Stephanie, Owsianski-Hille, Nicole, Derlin, Thorsten, Berding, Georg, Bengel, Frank M.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2016; Springer Nature B.V
• Subjects: Adult; Aged; Aged, 80 and over; Beds - adverse effects; Cardiology; Comparative studies; Female; Humans; Imaging; Male; Medical imaging; Medicine; Medicine & Public Health; Middle Aged; Motion; Multimodal Imaging - methods; Neoplasms - diagnostic imaging; Nuclear Medicine; Oncology; Original Article; Orthopedics; Patient Positioning - adverse effects; Patient Positioning - methods; Positron-Emission Tomography - methods; Radiology; Tomography; Tomography, X-Ray Computed - methods; Whole Body Imaging - methods; Hybrid imaging; Continuous bed motion; Whole-body imaging; PET/CT
• ISSN: 1619-7070; 1619-7089
• DOI: 10.1007/s00259-015-3226-z

Purpose
Continuous bed motion has recently been introduced for whole-body PET/CT, and represents a paradigm shift towards individualized and flexible acquisition without the limitations of bed position-based planning. Increased patient comfort due to lack of abrupt table position changes may be another albeit still unproven advantage. For robust clinical implementation, image quality and quantitative accuracy should at least be equal to the prior standard of bed position-based step-and-shoot imaging.
Methods
The study included 68 consecutive patients referred for whole-body PET/CT for various malignancies. The patients underwent traditional step-and-shoot and novel continuous bed motion acquisition in the same session in a randomized crossover design. The patients and two independent observers were blinded to the sequence of scan techniques. Patient comfort/satisfaction was examined using a standardized questionnaire. SUVs were compared for reference tissue (liver, muscle) and tumour lesions. PET image quality and misalignment with CT images were evaluated on a scale of 1 – 4.
Results
Patients preferred continuous bed motion over step-and-shoot (
P
 = 0.0001). It was considered to be more relaxing (38 % vs. 8 %), quieter (34 % vs. 8 %), and more fluid (64 % vs. 8 %). Image quality, SUV and CT misalignment did not differ between the techniques. Continuous bed motion resulted in better end-plane image quality (
P
 < 0.0001). Regardless of the technique, second examinations had significantly higher tumour lesion SUVmax values (
P
 = 0.0002), and a higher CT misalignment score (
P
 = 0.0017).
Conclusion
Oncological PET/CT with continuous bed motion enhances patient comfort and is associated with image quality at least comparable to that with traditional bed position-based step-and-shoot acquisition.qq