-
Article type: Cover
2001 Volume 57 Issue 2 Pages
Cover11-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
2001 Volume 57 Issue 2 Pages
Toc9-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
2001 Volume 57 Issue 2 Pages
Toc10-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2001 Volume 57 Issue 2 Pages
I-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
II-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
II-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
III-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
IV-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
IV-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
V-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
VI-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
VII-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
VIII-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
VIII-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
IX-XI
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
XII-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
App1-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
101-105
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
106-109
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
110-117
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
118-153
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
App2-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
155-184
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
MITSUYOSHI MATSUMOTO
Article type: Article
2001 Volume 57 Issue 2 Pages
185-189
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
SHIGETOSHI YOSHIDA
Article type: Article
2001 Volume 57 Issue 2 Pages
190-193
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
MASAYUKI TSUDA
Article type: Article
2001 Volume 57 Issue 2 Pages
194-199
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
JYUNNJI MORISITA, [in Japanese], [in Japanese], [in Japanese], [in Jap ...
Article type: Article
2001 Volume 57 Issue 2 Pages
200-202
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
HIROAKI KATO
Article type: Article
2001 Volume 57 Issue 2 Pages
203-206
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
MAIKO SAWADA
Article type: Article
2001 Volume 57 Issue 2 Pages
207-209
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
210-213
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TOSHIMINE YABUTANI, SHOUICHI SUZUKI, MASANAO KATO, HIROFUMI ANNO
Article type: Article
2001 Volume 57 Issue 2 Pages
215-222
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
Current stereotactic irradiation techniques with high-energy photon beams are based either on gamma units that use 201 stationary cobalt beams or on isocentric linear accelerators. The techniques using linear accelerators are divided into multiple non-coplanar techniques and others, all of which have their respective physical characteristics, such as precision of dose convergence and isodose distribution. Conformational stereotactic irradiation was developed in order to improve the precision of dose convergence, and we compared isodose distributions to conventional multiple shots of stereotactic irradiation by the film method using a globular Mix-Dp phantom with a diameter of 20cm. Results were as follows:(1) isodose distribution was shown as curved lines with conformational stereotactic irradiation, rather than the simple ovals with multiple-isocenter stereotactic irradiation;(2) the precision of dose convergence of simple shaped conformational stereotactic irradiation was equal to that of multiple-isocenter stereotactic irradiation;(3) the possibility existed of deterioration of the precision of dose convergence according to complex shaped conformational stereotactic irradiation.
View full abstract
-
HIROSHI IIDA, MITSURU SHIMIZU, SAKIO TAMURA
Article type: Article
2001 Volume 57 Issue 2 Pages
223-233
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
purpose: To devise a new calibration method to measure intracranial aneurysm size on digital subtraction angiograms. Methods: Calibration planes were independently established at the upper and lower sides of a rotation center of the C-arm, and a calibration scale was placed in one of two calibration planes. One pair of digital subtraction angiograms of the aneurysm is taken from different rotation angles of the C-arm. The projection size of the aneurysm on the calibration plane and the three-dimensional coordinates of the aneurysm are calculated with a calibration scale from these angiograms. Thus, the aneurysm's size is calculated from the geometrical arrangement of the DSA system. To examine precision, we measured the size of seven vessel phantoms (caliber 1.77-12.00 mm) by both the catheter method and the new calibration method. Clinically, the digital subtraction angiograms of 22 cerebral aneurysms treated by endovascular occlusion with the Gugliclmi detachable coil were analyzed by the new calibration method. Results: The new calibration method correlated well with the catheter method (y=0.9726_x+0.0023,R^2=1). The error of the catheter method was 4.40%±3.29% (n=245), while that of the new calibration method was 3.63%±2.14% (n=1470), indicating that the new calibration method was significantly more precise (p<0.0001). It was found that aneurysmal size measured by the new calibration method correlated well with the maximum diameter of the Guglielmi detachable coil. Conclusion: Accurate digital subtraction angiographic measurements of intracranial aneurysm size could be obtained in most aneurysms. The measurements of intracranial aneurysm size measured by the new calibration method are highly useful as an index for the Guglielmi detachable coil technique.
View full abstract
-
HIROYUKI NAGASHIMA, NAOKI SANO, OSAMU NAKAMURA
Article type: Article
2001 Volume 57 Issue 2 Pages
234-242
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The JARP level dosimeter is the most suitable for absorbed dose determination in radiotherapy because of its high accuracy. However, in measuring the dose of an extremely small field, a dosimeter with a smaller active region is required. The active region of the MOSFET dosimeter is very small, having a volume of just 0.02mm^3. In this study, we evaluated the performance of MOSFET dosimeters with two different sensitivities and examined the usefulness of the MOSFET dosimeter in stereotactic radiosurgery. Using the high-sensitivity MOSFET dosimeter, we were able to reduce the experimental error of absorbed dose (<±1.8%), and, by correcting the sensitivity, we could use it as a field dosimeter. By turning detectors inside out, we could reduce directional dependence (<±1.8%). Correction was necessary in the TMR determination because peak depth shifts according to the material of the detector. In the determination of the dose distribution in the penumbra, the resolution of the MOSFET detectors was equal to that of the diamond detector. In the determination of OPF for the extremely small field, better results were obtained with MOSFET than with other small detectors. The high-sensitivity MOSFET dosimeter could properly evaluate the dose of an extremely small field and will be useful in dosimetry of the maximum dose of the field center in stereotactic radiosurgery.
View full abstract
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
243-245
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
246-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
246-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
246-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
247-248
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
249-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
250-251
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
App3-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
App4-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
App5-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 2 Pages
App6-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2001 Volume 57 Issue 2 Pages
Cover12-
Published: February 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS