Volume 12, Issue 1, Pages (January 2005)

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Volume 12, Issue 1, Pages 116-122 (January 2005) Intraoperative tumor segmentation and volume measurement in MRI-guided glioma surgery for tumor resection rate control1 Nobuhiko Hata, PhD, Yoshihiro Muragaki, MD, PhD, Takashi Inomata, BS, Takashi Maruyama, MD, PhD, Hiroshi Iseki, MD, PhD, Tomokatsu Hori, MD, PhD, Takeyoshi Dohi, MD, PhD Academic Radiology Volume 12, Issue 1, Pages 116-122 (January 2005) DOI: 10.1016/j.acra.2004.11.009 Copyright © 2005 Association of University Radiologists Terms and Conditions

Figure 1 Results of intraoperative tumor segmentation in case 7 performed using T2-weighted magnetic resonance imaging (MRI) (repetition time (TR): 1000 milliseconds; echo time (TE): 140 milliseconds; number of excitations (NEX): 1; matrix: 256 × 256; field of view: 230 mm × 230 mm; slice thickness: 1.5 mm; slice gap 3 mm). Images were obtained after dura opening (top row), initial tumor resection (middle row), and total resection of glioma (bottom row). Residual tumor of 1.9 mL, or 5.4% of the total tumor volume (35.1 mL) remained unresected. It was removed in the second half of the operation as is shown in T2-weighted MRI in the bottom row. Academic Radiology 2005 12, 116-122DOI: (10.1016/j.acra.2004.11.009) Copyright © 2005 Association of University Radiologists Terms and Conditions

Figure 2 Intraoperative tumor segmentation in T2-weighted magnetic resonance imaging after dura opening (top row), initial tumor resection (middle row), and total resection of glioma (bottom row) in case 8. The images in each row are shown in the inferior-to-superior order. Note that the fuzzy connectedness-based segmentation clearly delineates the tumor and cyst boundary in the first scan (top row). In the second scan (middle row), 2.6 mL, or 6.2%, of the tumor (42.1 mL before the resection) was delineated by segmentation. No tumor was observed in the images obtained before dura closure (bottom row). Academic Radiology 2005 12, 116-122DOI: (10.1016/j.acra.2004.11.009) Copyright © 2005 Association of University Radiologists Terms and Conditions

Figure 3 Intensity profiles obtained from original gray-scale T2-weighted magnetic resonance imaging (MRI) (top) and fuzzy science (bottom) after fuzzy connectivity-based segmentation. Compared with the intensity profiles obtained along the right-left line (top middle) and the anterior-posterior line (top right) in gray-scale MRI, the profiles along the right-left line (bottom middle) and the anteroposterior line (bottom right) in fuzzy scene have more distinct tumor delineation. Academic Radiology 2005 12, 116-122DOI: (10.1016/j.acra.2004.11.009) Copyright © 2005 Association of University Radiologists Terms and Conditions