Arc Back Projection with an Efficient Computation for Ultrasound Reflection Mode Tomography
Many types of imaging systems using ultrasound have been developed to visualize 2-dimensional cross-sections for medical diagnosis, nondestructive testing and other purposes. However, spatial resolution in such acoustical imaging systems is relatively poor, when compared with the CT systems using X-rays. The fundamental limitation is due to the long wavelength of ultrasound. Since the wavelength used in such applications is often very close to the required resolution limits, the diffraction effect may cause distortion. This problem may be solved by using ultrasonic diffraction tomography(UDT) [1,2]. Investigations of UDT which take the diffraction effect into account have been developed; In the investigations, a higher-order approximation of ultrasonic wave propagation is utilized. However, such methods require complicated calculations of wave propagation, resulting in great difficulty in computing.
KeywordsPoint Spread Function Projection Data Reflection Mode Back Projection Chirp Signal
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