title: Hepatectomy simulation discrepancy between radionuclide receptor imaging and CT volumetry: influence of decreased unilateral portal venous flow.
abstract: BACKGROUND
  Regional dysfunction demonstrated by Tc-99m-diethylenetriamine-penta-acetic acid-galactosyl human serum albumin (GSA) scintigraphy due to regional decrease in the portal venous flow has previously been reported. In this study, we call attention to the significance of unilateral portal venous flow decrease for preoperative hepatectomy simulation, and evaluate the hepatectomy simulation discrepancy between Tc-99m-GSA single-photon emission computed tomography (SPECT) and CT volumetry.
  
  
  METHODS
  Twenty-four hepatectomy candidates underwent preoperative hepatectomy simulation by both Tc-99m-GSA SPECT and CT volumetry. Both anatomical and functional resection ratios were calculated by means of CT volumetry and Tc-99m-GSA SPECT, respectively. The differences and ratios between anatomical and functional resection ratios were calculated in all patients, and compared in patients with and without unilateral portal venous flow decrease.
  
  
  RESULTS
  Anatomical resection ratios were 28.0 +/- 11.7 (mean +/- standard deviation) in patients with unilateral portal venous flow decrease, and 42.1 +/- 15.7 in patients without unilateral portal venous flow decrease (p = 0.0127). Functional resection ratios were 14.7 +/- 12.8 in patients with unilateral portal venous flow decrease and 40.5 +/- 14.6 in patients without (p = 0.0004). The differences between anatomical and functional resection ratios were 13.0 +/- 7.9 in patients with unilateral portal venous flow decrease and 5.6 +/- 3.1 in patients without (p = 0.0099). The ratios between anatomical and functional resection ratios were 0.48 +/- 0.29 in patients with unilateral portal venous flow decrease and 0.86 +/- 0.10 in patients without (p = 0.0018). In 12 of the 13 patients with unilateral portal venous flow decrease, anatomical resection ratios were found to be larger than functional resection ratios, whereas this happened in only 6 of 11 patients without unilateral portal venous flow decrease (p = 0.0063).
  
  
  CONCLUSIONS
  Unilateral portal venous flow decrease is suspected to be a major factor in the discrepancy between hepatectomy simulations with radionuclide receptor imaging and CT volumetry.
authors.affiliation: Department of Radiology, Okayama University Medical School, Japan. akaki@cc.okayama-u.ac.jp
authors.forename: Shiro
authors.initials: S
authors.lastname: Akaki
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Okumura
authors.forename: Nobuya
authors.initials: N
authors.lastname: Sasai
authors.forename: Shuhei
authors.initials: S
authors.lastname: Sato
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Tsunoda
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kuroda
authors.forename: Susumu
authors.initials: S
authors.lastname: Kanazawa
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Hiraki
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003198:Computer Simulation; D005260:Female; D006498:Hepatectomy / Q000379:methods*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008099:Liver / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000601:surgery*; D008100:Liver Abscess / Q000000981:diagnostic imaging / Q000601:surgery; D008107:Liver Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D008113:Liver Neoplasms / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging; D011300:Preoperative Care; D019275:Radiopharmaceuticals; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013668:Technetium Tc 99m Aggregated Albumin; D016284:Technetium Tc 99m Pentetate; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods
chemical_list: D019275:Radiopharmaceuticals; D013668:Technetium Tc 99m Aggregated Albumin; C070561:technetium Tc 99m DTPA-galactosyl-human serum albumin; D016284:Technetium Tc 99m Pentetate