Feasebility of optimizing the dose distribution in lung tumors using fluorine-18-fluorodeoxyglucose positron emission tomography and single photon emission computed tomography guided dose prescriptions

S. K. Das, M. M. Miften, S. Zhou, M. Bell, M. T. Munley, C. S. Whiddon, O. Craciunescu, A. H. Baydush, T. Wong, J. G. Rosenman, M. W. Dewhirst, L. B. Marks

Research output: Contribution to journalArticle

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Abstract

The information provided by functional images may be used to guide radiotherapy planning by identifying regions that require higher radiation dose. In this work we investigate the dosimetric feasibility of delivering dose to lung tumors in proportion to the fluorine-18-fluorodeoxyglucose activity distribution from positron emission tomography (FDG-PET). The rationale for delivering dose in proportion to the tumor FDG-PET activity distribution is based on studies showing that FDG uptake is correlated to tumor cell proliferation rate, which is shown to imply that this dose delivery strategy is theoretically capable of providing the same duration of local control at all voxels in tumor. Target dose delivery was constrained by single photon emission computed tomography (SPECT) maps of normal lung perfusion, which restricted irradiation of highly perfused lung and imposed dose-function constraints. Dose-volume constraints were imposed on all other critical structures. All dose-volume/function constraints were considered to be soft, i.e., critical structure doses corresponding to volume/function constraint levels were minimized while satisfying the target prescription, thus permitting critical structure doses to minimally exceed dose constraint levels. An intensity modulation optimization methodology was developed to deliver this radiation, and applied to two lung cancer patients. Dosimetric feasibility was assessed by comparing spatially normalized dose-volume histograms from the nonuniform dose prescription (FDG-PET proportional) to those from a uniform dose prescription with equivalent tumor integral dose. In both patients, the optimization was capable of delivering the nonuniform target prescription with the same ease as the uniform target prescription, despite SPECT restrictions that effectively diverted dose from high to low perfused normal lung. In one patient, both prescriptions incurred similar critical structure dosages, below dose-volume/function limits. However, in the other patient, critical structure dosage from the nonuniform dose prescription exceeded dose-volume/function limits, and greatly exceeded that from the uniform dose prescription. Strict compliance to dose-volume/function limits would entail reducing dose proportionality to the FDG-PET activity distribution, thereby theoretically reducing the duration of local control. Thus, even though it appears feasible to tailor lung tumor dose to the FDG-PET activity distribution, despite SPECT restrictions, strict adherence to dose-volume/function limits could compromise the effectiveness of functional image guided radiotherapy.

Original languageEnglish (US)
Pages (from-to)1452-1461
Number of pages10
JournalMedical physics
Volume31
Issue number6
DOIs
StatePublished - Jun 2004

Fingerprint

Fluorodeoxyglucose F18
Single-Photon Emission-Computed Tomography
Positron-Emission Tomography
Prescriptions
Lung
Neoplasms
Image-Guided Radiotherapy
Radiation
Lung Neoplasms
Radiotherapy
Perfusion
Cell Proliferation

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

Cite this

Feasebility of optimizing the dose distribution in lung tumors using fluorine-18-fluorodeoxyglucose positron emission tomography and single photon emission computed tomography guided dose prescriptions. / Das, S. K.; Miften, M. M.; Zhou, S.; Bell, M.; Munley, M. T.; Whiddon, C. S.; Craciunescu, O.; Baydush, A. H.; Wong, T.; Rosenman, J. G.; Dewhirst, M. W.; Marks, L. B.

In: Medical physics, Vol. 31, No. 6, 06.2004, p. 1452-1461.

Research output: Contribution to journalArticle

Das, SK, Miften, MM, Zhou, S, Bell, M, Munley, MT, Whiddon, CS, Craciunescu, O, Baydush, AH, Wong, T, Rosenman, JG, Dewhirst, MW & Marks, LB 2004, 'Feasebility of optimizing the dose distribution in lung tumors using fluorine-18-fluorodeoxyglucose positron emission tomography and single photon emission computed tomography guided dose prescriptions', Medical physics, vol. 31, no. 6, pp. 1452-1461. https://doi.org/10.1118/1.1750991
Das, S. K. ; Miften, M. M. ; Zhou, S. ; Bell, M. ; Munley, M. T. ; Whiddon, C. S. ; Craciunescu, O. ; Baydush, A. H. ; Wong, T. ; Rosenman, J. G. ; Dewhirst, M. W. ; Marks, L. B. / Feasebility of optimizing the dose distribution in lung tumors using fluorine-18-fluorodeoxyglucose positron emission tomography and single photon emission computed tomography guided dose prescriptions. In: Medical physics. 2004 ; Vol. 31, No. 6. pp. 1452-1461.
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