1997 Fiscal Year Final Research Report Summary
Manufacturing of Highly Precise Diameter Measurement System Using a Coronary Cineangiogram
| Project/Area Number |
07505015
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
計測・制御工学
|
|---|
| Research Institution | National Cardiovascular Center Research Institute |
|---|
Principal Investigator |
UYAMA Chikao National Cardiovascular Center Research Institut, Dept.of Investigative Radiology, Director, 放射線医学部, 部長 (30026059)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MATSUOKA Seiji Ikegami Tsushki Co.Ltd, Div.of Information Instruments, Staff, 研究員
KAWAGUCHI Akito National Cardiovascular Center Research Institute, Dept.of Etiology and Pathogen, 病因部, 室員 (70214608)
NONOGI Hiroshi National Cardiovascular Center Hospital, Dept.of Internal Cardiology, Director, 内科心臓部門, 部長
MIYATAKE Kunio National Cardiovascular Center Hospital, Dept.of Internal Cardiology, Director, 内科心臓部門, 部長
|
|---|
| Project Period (FY) |
1995 – 1997
|
| Keywords | precise diameter measurement / coronary antery / coronary cineangiogram / digital image / high magnification image |
|---|
| Research Abstract |
Highly precise diameter measurement using a coronary cineangiogram was performed. A meaurement system includes two parts, image acquiring mechanism of a cineangiogram and image processing for diameter measurement. In USA and Europe, magnification rate of less than 4 times is applied. Kurisu et al (1987) reported the diameter changesduring one cardiac aisle applying a line sensor. The equivalent magnification rate on cine images was aout 10 times. Their study confirmed that the magnification x 10 of cine images is meaningful. Our im using this system is to detect subtle diameter change between two time points spacing several years.
The image acquiring subsystem has two cameras, TV camera for monitoring and magnification camera for enlarging images. The subsystem has control mechanism such that by entering two points on a monitor image along a specified coronary artery whose diameter is measured, the optic axis of the magnification camera is rotated so that the arterial axis is observed parallel to X-axis of the image.
Entropy filter was applied in the image processing subsystem. According to our previous work (1993), the entropy filter provides us good accuracy and precision for measuring diameters.
The diameter measurement is automatically executed. In addition, at the end of each step of the image processing, an operator can see the result if something wrong happened in the result. If the result is wrong, the operator can interrupt the calculation and correct or improve the result.
For the comparison of two diameters between two time points, the calibration must be established. The conclusion of the study is that 5F-and 6Fcatheters can be used for calibration as long as a subject was inserted by catheters from single catalog type both two time points.
|
