RESUMO
U-Pb dating was conducted for zircons from a total of 14 samples from 13 granite bodies in southwestern Cambodia using LA-ICP-MS. The granitic rock samples were collected from southwestern Cambodia, southwest of the Mae Ping Fault extending from northwest Cambodia via Tonle Sap Lake to southern Vietnam. The studied rock bodies belong to the ilmenite-series, except for three granitic rock bodies. They were identified as I-or A-type. The analysis yielded three distinct age ranges: 295-309, 191-232, and 75-98 Ma. The 295-309 Ma ages are associated with the Paleo-Tethys Sea subduction beneath the Indochina Block. The ages of 191-232 Ma may correspond to the amalgamation period of the Sibumasu and Indochina Blocks during the Indosinian Orogeny. Granitic rocks with ages of 75-98 Ma occur near the southeastern Cambodia-southern Vietnam border. Formation of these granitic rocks was associated with the Paleo-Pacific Ocean Plate (the Izanagi Plate) subduction beneath the Indochina Block. The region in which these granitic rocks occur is part of the Dalat-Kratie Zone.
RESUMO
The purpose of this study was to evaluate the clinical usefulness of three-dimensional (3D) fusion imaging of lymphoscintigraphy with 99mTc phytate and MDCT (four-slice CT) for sentinel node biopsy in breast cancer. Volume-rendering images generated by MDCT were fused with lymphoscintigrams on a personal computer. The subjects were 7 patients with clinically negative nodes. In all patients, sentinel nodes were identified by lymphoscintigraphy, and the anatomical locations of sentinel nodes were clearly demonstrated by 3D-fusion imaging. 3D-fusion imaging of lymphoscintigraphy and MDCT is expected to be a promising method for sentinel node biopsy in breast cancer.
