Journal article
Qualitative and Quantitative Comparison of PET/CT and PET/MR Imaging in Clinical Practice
The Journal of nuclear medicine (1978), Vol.55(1), pp.88-94
01/01/2014
DOI: 10.2967/jnumed.113.123547
PMID: 24337608
Abstract
The aim of this study was to prospectively compare whole-body PET/MR imaging and PET/CT, qualitatively and quantitatively, in oncologic patients and assess the confidence and degree of inter-and intraobserver agreement in anatomic lesion localization. Methods: Fifty patients referred for staging with known cancers underwent PET/CT with low-dose CT for attenuation correction immediately followed by PET/MR imaging with 2-point Dixon attenuation correction. PET/CT scans were obtained according to standard protocols (56 +/- 20 min after injection of an average 367 MBq of F-18-FDG, 150 MBq of Ga-68-DOTATATE, or 333.8 MBq of F-18-fluoro-ethyl-choline; 2.5 min/bed position). PET/MR was performed with 5 min/bed position. Three dual-accredited nuclear medicine physicians/radiologists identified the lesions and assigned each to an exact anatomic location. The image quality, alignment, and confidence in anatomic localization of lesions were scored on a scale of 1-3 for PET/CT and PET/MR imaging. Quantitative analysis was performed by comparing the standardized uptake values. Intraclass correlation coefficients and the Wilcoxon signed-rank test were used to assess intra-and interobserver agreement in image quality, alignment, and confidence in lesion localization for the 2 modalities. Results: Two hundred twenty-seven tracer-avid lesions were identified in 50 patients. Of these, 225 were correctly identified on PET/CT and 227 on PET/MR imaging by all 3 observers. The confidence in anatomic localization improved by 5.1% when using PET/MR imaging, compared with PET/CT. The mean percentage interobserver agreement was 96% for PET/CT and 99% for PET/MR imaging, and intraobserver agreement in lesion localization across the 2 modalities was 93%. There was 10% (5/50 patients) improvement in local staging with PET/MR imaging, compared with PET/CT. Conclusion: In this first study, we show the effectiveness of whole-body PET/MR imaging in oncology. There is no statistically significant difference between PET/MR imaging and PET/CT in respect of confidence and degree of inter-and intraobserver agreement in anatomic lesion localization. The PET data on both modalities were similar; however, the observed superior soft-tissue resolution of MR imaging in head and neck, pelvis, and colorectal cancers and of CT in lung and mediastinal nodal disease points to future tailored use in these locations.
Details
- Title: Subtitle
- Qualitative and Quantitative Comparison of PET/CT and PET/MR Imaging in Clinical Practice
- Creators
- Khalsa Z. Al-Nabhani - University College HospitalRizwan Syed - University College HospitalSofia Michopoulou - University College HospitalJokha Alkalbani - University College HospitalAsim Afaq - University College HospitalEmmanouil Panagiotidis - University College HospitalCelia O'Meara - University College HospitalAshley Groves - University College HospitalPeter Ell - University College HospitalJamshed Bomanji - University College Hospital
- Resource Type
- Journal article
- Publication Details
- The Journal of nuclear medicine (1978), Vol.55(1), pp.88-94
- DOI
- 10.2967/jnumed.113.123547
- PMID
- 24337608
- NLM abbreviation
- J Nucl Med
- ISSN
- 0161-5505
- eISSN
- 1535-5667
- Publisher
- Soc Nuclear Medicine Inc
- Number of pages
- 7
- Grant note
- 16463 / Cancer Research UK
- Language
- English
- Date published
- 01/01/2014
- Academic Unit
- Radiology
- Record Identifier
- 9984318688602771
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