The impact of functional imaging on radiation medicine.
Radiation medicine has previously utilized planning methods based primarily on anatomic and volumetric imaging technologies such as CT (Computerized Tomography), ultrasound, and MRI (Magnetic Resonance Imaging). In recent years, it has become apparent that a new dimension of non-invasive imaging studies may hold great promise for expanding the utility and effectiveness of the treatment planning process. Functional imaging such as PET (Positron Emission Tomography) studies and other nuclear medicine based assays are beginning to occupy a larger place in the oncology imaging world. Unlike the previously mentioned anatomic imaging methodologies, functional imaging allows differentiation between metabolically dead and dying cells and those which are actively metabolizing. The ability of functional imaging to reproducibly select viable and active cell populations in a non-invasive manner is now undergoing validation for many types of tumor cells. Many histologic subtypes appear amenable to this approach, with impressive sensitivity and selectivity reported. For clinical radiation medicine, the ability to differentiate between different levels and types of metabolic activity allows the possibility of risk based focal treatments in which the radiation doses and fields are more tightly connected to the perceived risk of recurrence or progression at each location. This review will summarize many of the basic principles involved in the field of functional PET imaging for radiation oncology planning and describe some of the major relevant published data behind this expanding trend.
Sharma
Nidhi
N
Department of Radiation Oncology, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA. sharman2@ccf.org
Neumann
Donald
D
Macklis
Roger
R
D003952:Diagnostic Imaging / Q000379:methods; D006801:Humans; D006278:Medicare; D009367:Neoplasm Staging / Q000295:instrumentation / Q000379:methods; D009369:Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D009683:Nuclear Medicine / Q000379:methods; D049268:Positron-Emission Tomography / Q000191:economics* / Q000295:instrumentation* / Q000379:methods*; D018787:Radiation Oncology / Q000379:methods*; D019275:Radiopharmaceuticals / Q000627:therapeutic use; D014481:United States
D019275:Radiopharmaceuticals
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