10 March 2008 3D PSF analysis for arbitrary transducer geometries and SAFT-based image reconstruction
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Abstract
The point spread function (PSF) of an imaging system may be used as measure for the imaging quality. The PSF usually depends on position and an several other system parameters. Our current 3D imaging system for ultrasound computer tomography consists of a rotatable cylinder with approx. 2000 ultrasound transducers. 3D images are reconstructed by means of synthetic aperture focusing technique (SAFT) using all available emitter-receiver-combinations. No analytical solution exists for determining the spatially varying PSF for arbitrary placement of the transducers. This work derives a new numerical approach for the approximation of the 3D PSF for arbitrary transducer geometries including the beam pattern of the ultrasound transducers, a directional point scatterer model, damping of the breast and arbitrary pulse shapes. As an exemplary application the spatially varying 3D PSF of the current cylindrical geometry is analyzed under idealized conditions (point sources, no damping, and isotropic scattering) and compared to non-idealized results of the PSF analysis. The results show the necessity to take the system specific parameters into account for a realistic prognosis of 3D imaging performance.
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Gregor F. Schwarzenberg, Gregor F. Schwarzenberg, Hartmut Gemmeke, Hartmut Gemmeke, Nicole V. Ruiter, Nicole V. Ruiter, } "3D PSF analysis for arbitrary transducer geometries and SAFT-based image reconstruction", Proc. SPIE 6920, Medical Imaging 2008: Ultrasonic Imaging and Signal Processing, 69200A (10 March 2008); doi: 10.1117/12.770477; https://doi.org/10.1117/12.770477
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