Tangential Radiography Detectability Improvement by Tomosynthesis Techniques
Usually, disbonds on solid rocket motors are examined by tangential radiography. The motor is rotated around its axis and radiographs are taken at video rate on the border of the motor. Due to the high attenuation of X-rays through the motor, the signal-to-noise ratio of the delamination is very poor. On a single radiograph, even large defect are difficult to detect. Usually, when a defect is detected, the motor rotation is stopped and the photon noise is reduced by summing a lot of radiographs at the same orientation.
KeywordsMotor Rotation Photon Noise Patent Cooperation Treaty Acquisition Geometry Solid Rocket Motor
Unable to display preview. Download preview PDF.
- 3.K. R. Maravilla, R. C. Murphy, J. Diehl, R. Suss, L. Allen, K. Chang, J. Crawford and R. McCoy, “Digital Tomosynthesis: technique modifications and clinical applications for neurovascular anatomy”, Radiol., 152 (1984), pp. 719–724.Google Scholar
- 4.B.D. Baker, International application published under the patent cooperation treaty No.PCT/US91/06090 (19 March 1992).Google Scholar
- 6.Ph. Rizo, P. Grangeat, R. Guillemaud, “Geometric Calibration method for multiple-head cone-beam SPECT system”, to be published in IEEE Transaction on Nuclear science, (Oct. 1994).Google Scholar
- 8.G. Arfken, Mathematical methods for physicists, third edition, New York: Academic Press, (1985), pp. 198–200.Google Scholar