Radiology - Research Publications

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End date: 2009 × Author: Hicks, Rodney ×

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    PET/CT: will it change the way that we use CT in cancer imaging?
    HICKS, R ; Ware, REW ; LAU, W ( 2006)
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    Hybrid imaging is the future of molecular imaging.
    Hicks, R ; Lau, E ; Binns, D (Department of Biomedical Imaging, University of Malaya, Malaysia, 2007-07)
    Correlative imaging has long been used in clinical practice and particularly for the interpretation of nuclear medicine studies wherein detailed anatomical information is often lacking. Previously, side-by-side comparison or software co-registration techniques were applied but suffered from technical limitations related to the differing geometries of the imaging equipment, differences in the positioning of patients and displacement of mobile structures between studies. The development of the first hybrid PET and CT device struck a chord with the medical imaging community that is still ringing loudly throughout the world. So successful has been the concept of PET-CT that none of the major medical imaging manufacturers now offers stand-alone PET scanners. Following close behind this success, SPECT-CT devices have recently been adopted by the nuclear medicine community, already compelled by the benefits of hybrid imaging through their experience with PET-CT. Recent reports of adaptation of PET detectors to operate within the strong magnetic field of MRI scanners have generated further enthusiasm. Prototype PET-MRI devices are now in development. The complementary anatomical, functional and molecular information provided by these techniques can now be presented in an intuitive and aesthetically-pleasing format. This has made end-users more comfortable with the results of functional imaging techniques than when the same information is presented independently. Despite the primacy of anatomical imaging for locoregional disease definition, the molecular characterisation available from PET and SPECT offers unique complementary information for cancer evaluation. A new era of cancer imaging, when hybrid imaging will be the primary diagnostic tool, is approaching.
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    Early therapeutic response assessment by 18FDG-positron emissiontomography during chemotherapy in patients with diffuse large B-celllymphoma: isolated residual positivity involving bone is not usually a predictor of subsequent treatment failure
    Ng, Ashley P. ; WIRTH, ANDREW ; SEYMOUR, JOHN ; Lee, Michael ; Hogg, Annette ; JANUSZEWICZ, HENRY ; WOLF, MIECZYSLAW ; Prince, H Miles ; MACMANUS, MICHAEL ; Hicks, Rodney J. (Taylor & Francis, 2007-03)
    Residual 2-fluoro-2-deoxyglucose (FDG) – positron emission tomography (PET) positivity during treatment of patients withdiffuse large B-cell lymphoma (DLBLC) prospectively identifies a subgroup at high likelihood of subsequent treatmentfailure. A single institution clinical audit of FDG-PET performance for this indication was undertaken for patients withDLBCL treated with anthracycline-based chemotherapy+radiotherapy. Of 45 eligible patients, 14 (31%) were PETpositiveafter a median of three chemotherapy cycles (range 1 – 5), of which 10 (71%) progressed at a median of 6.5 months.An interim positive PET was a statistically significant adverse prognostic factor for treatment failure (P=0.0001, log-rankanalysis) with a hazard ratio for a positive interim-treatment PET of 9 (95% confidence interval 4 – 55) and positivepredictive value of 71% and negative predictive value of 90%. Notably, four patients with low-grade FDG-avidity limited tosites previously involved by biopsy-proven osseous lymphoma, remain progression-free (median follow-up 62 months). LowgradeFDG-avidity on interim restaging at sites of bone involvement by DLBCL at diagnosis, appears to be less predictive ofdisease progression than residual nodal or extra-nodal soft tissue abnormality by PET.