Incorporating Quantitative Single Photon Emission Computed Tomography into Radiation Therapy Treatment Planning for Lung Cancer: Impact of Attenuation and Scatter Correction on the Single Photon Emission Computed Tomography–Weighted Mean Dose and Functional Lung Segmentation

• Published in: International journal of radiation oncology, biology, physics Vol. 78; no. 2; pp. 587 - 594
• Main Authors: Yin, Lingshu, Shcherbinin, Sergey, Celler, Anna, Thompson, Anna, Fua, Tsien-Fei, Liu, Mitchell, Duzenli, Cheryl, Gill, Brad, Sheehan, Finbar, Powe, John, Worsley, Daniel, Marks, Lawrence, Moiseenko, Vitali
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.10.2010; Elsevier
• Subjects: Algorithms; ATTENUATION; Biological and medical sciences; BODY; Carcinoma, Non-Small-Cell Lung - diagnostic imaging; Carcinoma, Non-Small-Cell Lung - pathology; Carcinoma, Non-Small-Cell Lung - radiotherapy; COMPUTERIZED TOMOGRAPHY; CORRECTIONS; DIAGNOSTIC TECHNIQUES; DISEASES; DOSES; EMISSION COMPUTED TOMOGRAPHY; Functional lung segmentation; Hematology, Oncology and Palliative Medicine; Humans; Image Interpretation, Computer-Assisted - methods; Lung - diagnostic imaging; Lung cancer; Lung Neoplasms - diagnostic imaging; Lung Neoplasms - pathology; Lung Neoplasms - radiotherapy; LUNGS; Medical sciences; MEDICINE; NEOPLASMS; NUCLEAR MEDICINE; ORGANS; Phantoms, Imaging; PLANNING; Pneumology; Quantitative correction; RADIATION DOSES; Radiography; RADIOLOGY; RADIOLOGY AND NUCLEAR MEDICINE; RADIOTHERAPY; Radiotherapy Dosage; Radiotherapy Planning, Computer-Assisted - methods; RESPIRATORY SYSTEM; Scattering, Radiation; Sensitivity and Specificity; SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY; Small Cell Lung Carcinoma - diagnostic imaging; Small Cell Lung Carcinoma - radiotherapy; Software; SPECT-weighted mean dose; THERAPY; TOMOGRAPHY; Tomography, Emission-Computed, Single-Photon - methods; Treatment planning; Tumor Burden; Tumors of the respiratory system and mediastinum; SPECT-weighted mean dose; Quantitative correction; Functional lung segmentation; Treatment planning; Lung cancer; Radionuclide study; Lung disease; Segmentation; Image processing; Respiratory disease; Lung; Malignant tumor; Single photon emission tomography; Radiotherapy; Respiratory system; Weight; Bronchus disease; Attenuation; Corrections; Cancer
• ISSN: 0360-3016; 1879-355X; 1879-355X
• DOI: 10.1016/j.ijrobp.2009.11.035

To assess the impact of attenuation and scatter corrections on the calculation of single photon emission computed tomography (SPECT)–weighted mean dose (SWMD) and functional volume segmentation as applied to radiation therapy treatment planning for lung cancer. Nine patients with lung cancer underwent a SPECT lung perfusion scan. For each scan, four image sets were reconstructed using the ordered subsets expectation maximization method with attenuation and scatter corrections ranging from none to a most comprehensive combination of attenuation corrections and direct scatter modeling. Functional volumes were segmented in each reconstructed image using 10%, 20%, …, 90% of maximum SPECT intensity as a threshold. Systematic effects of SPECT reconstruction methods on treatment planning using functional volume were studied by calculating size and spatial agreements of functional volumes, and V 20 for functional volume from actual treatment plans. The SWMD was calculated for radiation beams with a variety of possible gantry angles and field sizes. Functional volume segmentation is sensitive to the particular method of SPECT reconstruction used. Large variations in functional volumes, as high as >50%, were observed in SPECT images reconstructed with different attenuation/scatter corrections. However, SWMD was less sensitive to the type of scatter corrections. SWMD was consistent within 2% for all reconstructions as long as computed tomography–based attenuation correction was used. When using perfusion SPECT images during treatment planning optimization/evaluation, the SWMD may be the preferred figure of merit, as it is less affected by reconstruction technique, compared with threshold-based functional volume segmentation.