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THE MOST PRACTICAL INTRAORAL DIGITAL X-RAY IMAGING

Research Project

Project/Area Number 08457501
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 病態科学系歯学(含放射線系歯学)
Research InstitutionTOKYO DENTAL COLLEGE

Principal Investigator

KUROYANAGI Kinya  TOKYO DENTAL COLLEGE,DEPARTMENT OF DENTISTRY,PROFESSOR, 歯学部, 教授 (60085751)

Co-Investigator(Kenkyū-buntansha) NISHIKAWA Keiichi  TOKYO DENTAL COLLEGE,DEPARTMENT OF DENTISTRY,ASSISTANT, 歯学部, 助手 (30180590)
HAYAKAWA Yoshihiko  TOKYO DENTAL COLLEGE,DEPARTMENT OF DENTISTRY,LECTURER, 歯学部, 講師 (70164928)
WAKOH Mamoru  TOKYO DENTAL COLLEGE,DEPARTMENT OF DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 助教授 (70211670)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥3,400,000 (Direct Cost: ¥3,400,000)
KeywordsINTRAORAL / DIGITAL / RADIOGRAPHY / CHARACTERISTIC CURVE / CCD
Research Abstract

Several investigations were carried out to design the most practical intraoral digital x-ray imaging system with CCD (Charge-Coupled Device) sensor under consideration of on the response properties to x-ray.
Firstly, dark current property, gradient and dynamic range, granularity, tube voltage dependency, tube current dependency, and contrast resolution of commercially available systems were evaluated. Each system showed the difference especially in the dark current property and the dynamic range. The bit number for quantization of gray scale should be set at more than 12 to get rid of the effect of the dark current. The dynamic ranges were 1 : 25-1 : 35.
Secondly, relations between the gain value to amplify the analog output signals from the CCD sensor and the dynamic range obtained with digitization of the amplified signals were investigated using the kit for evaluation of CCD sensor properties. The dynamic range could be changed to 1 : 45, which was wider than those of the existing systems.
To decide the dynamic range required in minimum and optimize the gradient in response properties to x-ray, the x-ray contrast in the maxillary molar region was analyzed becouse the largest x-ray contrast in intraoral radiography is obtained in there. The dynamic range required was 1 : 12 at most. Therefore larger gradient, namely larger contrast resolution than those in the existing systems can be acquired by narrowing the dynamic range.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report

URL: 

Published: 1996-03-31   Modified: 2016-04-21  

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