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Revolutionary Impact of PET and PET-CT on the Day-To-Day Practice of Medicine and Its Great Potential for Improving Future Health Care*

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Revolutionary Impact of PET and PET-CT on the Day-To-Day Practice of Medicine and Its Great Potential for Improving Future Health Care* Nuclear Medicine Review 2009 Vol. 12, No. 1, pp. 1–13 Copyright © 2009 Via Medica ISSN 1506–9680 Editorial Revolutionary impact of PET and PET-CT on the day-to-day practice of medicine and its great potential for improving future health care* cations, this technique will likely become essential in almost any Sandip Basu1, 2, Abass Alavi1 medical disorder. 1Radiation Medicine Centre (BARC), Tata Memorial Hospital Annexe, Parel, Bombay India Key words: PET, PET-CT, 18[F]-fluorodeoxyglucose 2Division of Nuclear Medicine, Hospital of University of Pennsylvania, Philadelphia, United States Nuclear Med Rev 2009; 12, 1: 1–13 Introduction [Received 9 IV 2009; Accepted 6 V 2009] One of the most remarkable events in the history of medicine was the discovery of the X-ray by Roentgen in 1895. This was sub- Abstract sequently enhanced by the introduction of CT in 1973 by Sir God- frey Hounsfield with significant improvement in the sensitivity and In this communication, we present an overview of the impact specificity of structural imaging in medicine [1–3]. The introduction and advantages of PET and PET-CT fusion imaging in the prac- of MR imaging added another major dimension to the armamen- tice of medicine. We also discuss the evolution of this promising tarium available to the radiologist [4–7]. However, these powerful molecular imaging technique since its inception and the future structural imaging techniques have poor sensitivity for early dis- prospects of the combined structure-function approach. Supe- ease and suffer from major limitations for the assessment of early rior contrast resolution, accurate quantification and above all therapeutic response, which is of pivotal importance in the prac- optimal image quality aid in improved diagnosis of many seri- tice of oncology. In most settings, if there is minimal or no response, ous disorders including cancer. We speculate that this powerful then there is no benefit from the continued administration of toxic imaging approach will almost completely replace most other and expensive treatment. The shortcomings of anatomical imag- conventional methods in the future. Currently, 18[F]-fluorode- ing also apply to the accurate staging of many malignancies and -oxyglucose (FDG) is the main radiopharmaceutical employed the early detection of recurrence of cancer following therapeutic for PET studies around the globe. With the availability of high interventions. Therefore, imaging methods that allow accurate as- quality PET images on a routine basis in most centres around sessment of disease activity at any stage of the disease are essen- the world and the likelihood that several other useful PET trac- tial for optimal management of cancer patients. ers will be approved in the near future for routine clinical appli- Functional imaging with radiotracers is primarily based upon one or more of the following three approaches: — imaging physiological processes such as blood flow to an or- gan or diseased tissue; — visualizing ongoing biochemical and metabolic activities in the Correspondence to: Prof. Abass Alavi Division of Nuclear Medicine, Hospital of University of Pennsylvania normal and abnormal tissues; 3400 Spruce Street, Philadelphia 19104, United States — utilizing established pharmacological methodologies for diag- Tel: 215 662 3069, fax: 215 349 5843 nostic purposes and for developing new drugs. e-mail: [email protected] However, alterations in the metabolic and biochemical path- www.nmr.viamedica.pl 1 Editorial Nuclear Medicine Review 2009, Vol. 12, No. 1 ways may not always translate into physiological changes, such Positron emission tomography (PET) with FDG and other trac- as disrupted blood flow to the diseased site, early in the course of ers has overcome many of the shortcomings associated with the the disease. This is a major disadvantage of conventional nuclear competing modalities. Several newer positron-emitting radionu- medicine techniques as well as dynamic contrast-enhanced CT clides such as technetium-94 (94mTc), 68-Gallium (68Ga), and and functional MR imaging, which rely upon measuring physiolo- copper-64 (64Cu), labelled to the appropriate compounds, are ex- gical parameters for assessing organ function or pathological pected to be useful for diagnostic purposes and may further ex- states. In addition, despite their superior sensitivity over structural pand the domain of PET for functional studies [24]. This paper imaging, conventional functional imaging modalities lack the spe- reviews the current and future potential applications of this tech- cificity and precision that are achievable with techniques based on nology in the practice of medicine. biochemical and pharmacological principles. The fluorodeoxyglucose (FDG) technique was introduced in On the other hand, the functional imaging developed in the 1976 by investigators at the University of Pennsylvania, and the past three decades allows imaging at the molecular and cellular effectiveness of this modality as a molecular probe has been effec- levels and has proven to be extremely sensitive and quite specif- tively demonstrated in the investigation of a multitude of serious ic for assessing disease activity in several important clinical dis- disorders [25]. This agent was initially proposed as a novel tracer orders [8]. The target sites for these probes encompass a wide to determine regional brain function in normal physiological states variety of cell surface receptors, transporters, intracellular en- and in neuropsychiatric disorders [26]. The critical role of PET im- zymes, and messenger RNA. The source of the signal detected aging with FDG and with certain other tracers in the management by these techniques could originate directly from the molecule or of many diseases has now been well established. In addition, ex- from its surrogates [9]. Functional MRI allows the assessment of citing areas of research currently include imaging of gene expres- regional physiological and metabolic activity and the detection of sion [27, 28] and molecular targeting techniques that are being parameters such as alterations in cerebral blood flow and perfu- adopted for the development of new drugs [29, 30]. sion to an organ or diseased tissue [10–13]. However, the MR FDG-PET has been applied successfully to a number of neuro- contrast agents that target specific molecular sites such as cell logical disorders. The kinetics of hexokinase are altered in patients receptors or enzymes have proven to be relatively insensitive for with seizures [31], which affects FDG activity in the seizure foci, detecting adequate signals from tracer concentrations of these forming the basis for using FDG-PET in localizing the seizure fo- diagnostic compounds. Recently, NMR spectroscopic studies cus. FDG-PET imaging is effective in localizing seizure foci in the have shown that choline phospholipid metabolism is altered in temporal lobe for surgical interventions [32], and has a sensitivity cancer, especially in prostate and brain tumours, as well as in of 85% to 90% [32]. The seizure focus appears hypometabolic in breast cancer [14]. This modality has been shown to be useful for the interictal state when anatomic images appear normal [33–35]. characterizing many central nervous system disorders, such as However, in longstanding seizure disorders, a certain degree of multiple sclerosis, Parkinson's disease, and Alzheimer's disease atrophy may eventually be detectable by MR imaging [36–38]. In [15, 16]. The use of optical imaging as a molecular probe has Alzheimer’s disease, FDG-PET imaging appears critical for identi- been of considerable interest, but a major deficiency of this fying patients in whom the disease process is subtle, and before approach is the inability to visualize structures deeper than a few structural alterations have occurred; thus, modern treatments may centimetres from the surface [17]. Presently, optical imaging is be more successful [32, 39–52] (Figure 1). Several drugs designed being investigated for visualizing breast cancer [18, 19], for mon- to augment acetylcholine levels in the brain, a substrate whose itoring stroke [20, 21], the imaging of lymph nodes [22], and in deficiency has been implicated in the cognitive dysfunctions of this detecting disease processes near the endothelial surface in the disorder, are more effective in the early stages of Alzheimer’s dis- airways and gastrointestinal tract [23]. ease. Extrapyramidal disorders including Parkinson’s disease can A B Figure 1AB. Brain PET with FDG. Example of a scan of patient with Alzheimer's disease (AA) and in a normal subject (BB): evidence of reduced metabolism at bilateral parietal and temporal regions in the former. Reprinted with permission from Leadership Medica for Alavi et al. 2 www.nmr.viamedica.pl Editorial Sandip Basu, Abass Alavi, Revolutionary impact of PET and PET-CT on the day-to-day practice of medicine be accurately diagnosed with radiopharmaceuticals such as fluo- The use of FDG-PET imaging is considered the standard ap- rine-18-6-fluoro-l-dopa (F-DOPA) or radiopharmaceuticals that bind proach for determining myocardial viability. 82Rb shows great pro- to the dopamine transporter sites and therefore allow the detec- mise in detecting changes in myocardial perfusion [113]. FDG is tion of the degree of loss of presynaptic dopaminergic neurons taken up in atherosclerotic vessels [114]. There is evidence that [53–55]. Promising results have been obtained in the assessment the uptake is mainly located in the intima and probably represents
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