1991 Fiscal Year Final Research Report Summary
A new principle and devices for stereotactic radiosurgery using a linear accelerator
| Project/Area Number |
03670691
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Cerebral neurosurgery
|
|---|
| Research Institution | Toho University |
|---|
Principal Investigator |
TERAO Hideo Toho Uinversity, Medical School. Professor, 医学部, 教授 (60147519)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KANEKO Itsuo Toho University, Medical School. Assistant Professor, 医学部, 助教授 (30057509)
KOGURE Takashi Toho University, Medical School. Professor, 医学部, 教授 (80010198)
ENDO Go Toho University, Medical School. Assistant, 医学部, 助手
OOISHI Hitoshi Toho University, Medical School. Assistant, 医学部, 助手 (60185189)
NISHIKAWA Hideto Toho university, Medical School. Assistant, 医学部, 助手 (40189270)
|
|---|
| Project Period (FY) |
1990 – 1991
|
| Keywords | Stereotaxy, Radiosurgery, Linac, AVM / ライナック / 脳動静脈奇形 / 聴神経腫瘍 / 転移性脳腫瘍 |
|---|
| Research Abstract |
We have developed and manufactured new devices for stereotactic radiosurgery using a conventional linear accelerator (Linac). The system of consists of a rotatory chair with a base ring holder. Brown-Robert-Well's stereotactic apparatus with a doulbe set of base rings and a number of precise collimators which eliminate penumbra to the greatest extent. A sturdy rotatory chair was manufactured, whose vertical axis of rotation is always set and stable. Astrongly built, adjustable holder for Brown-Robert-Well's base ring is attached to the chair. The principle and flow of procedures step by step is as follows, 1)The rotatory chair is carried in under the Linac and the vertical axis of the chair is precisely adjusted to align with the vwetical center of the photon beam from the Linac. 2)A base ring and a locator of BRW's apparatus are mounted on a patient's head and three coordinates of a target are determined by CT scans. 3)The target indicator of the dummy set of BRW's apparatus is positi
… More
oned according to X, Y, Z, coordinate of the target. The tip of a rod pointer fixed on an instrument bloc on the arc device is precisely adjusted to touch at the tip of the target indicator. 4)The base ring and arc device with rod indicator are transfered together to the base ring holder. The tip of the rod indicator is precisely adjusted to be positioned at the isocenter of the Linac. 5) The base ring and arc device are removed and replaced by another base ring mounted on the head of a patient, who is made to sit on the rotatory chair. The target in the brain is now located at the isocenter of the Linac. Stereotactic radiation is started with rotation of the chair and circular movement of the gantry of Linac. 80 cases, including AVM, CCF, cavernous angioma, acoustic tumor and metastatic brain tumors have been treated by this method of treatment. Therapeutic effect has been proved to be satisfactory enough. AVM,CCF and most of metastatic tumors disappeared after the treatment. Advantages of stereotactic radiosurgery using our devices are not only its simplicity and medicoecconomical benefits, but also multiplicity of collimators and no need for exchange of Co-60 radiosources. Less
|
