Unified framework for modern synthetic aperture imaging algorithms

“…While lower frame rates would be acceptable within NDT, a different set of problems exist in that NDT components are metallic or composite in nature. Often, however, it is the same basic algorithms used in all fields but referred to by different names [4] , leading to confusion among non-specialists. Two synthetic aperture techniques (SAFT and TFM) are discussed in this section before a review of the VSA technique.…”

Section: Synthetic Aperturementioning

confidence: 99%

Virtual source aperture imaging for non-destructive testing

Sutcliffe¹,

Weston²,

Charlton³

et al. 2012

insight

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“…The lateral resolution of an synthetic aperture image is dependent on the bandwidth of the k x spectrum [21], and this bandwidth is limited by the effective length L of the transducer. A common rule of thumb for the single-layer case is that this makes the maximum lateral resolution approximately L/2 [11].…”

Section: G Comments On Theoretical Resolutionmentioning

confidence: 99%

Synthetic aperture focusing of ultrasonic data from multilayered media using an omega-K algorithm

Skjelvareid

Olofsson

Birkelund

et al. 2011

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-The synthetic aperture focusing technique (SAFT) is used to create focused images from ultrasound scans. SAFT has traditionally been applied only for imaging in a single medium, but the recently introduced Phase Shift Migration (PSM) algorithm has expanded the use of SAFT to multilayer structures. In this article we present a similar focusing algorithm called MULOK (MUlti-Layer Omega-K), which combines PSM and the ω−k algorithm to perform multilayer imaging more efficiently. The asymptotic complexity is shown to be lower for MULOK than for PSM, and this is confirmed by comparing execution times for implementations of both algorithms. To facilitate the complexity analysis, a detailed description of algorithm implementation is included, which also serves as a guide for readers interested in practical implementation. Using data from an experiment with a waterplexiglas-aluminium structure, we show that there is essentially no difference in image quality between the two algorithms.

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Unified framework for modern synthetic aperture imaging algorithms

Cited by 79 publications

References 16 publications

Satellite on-board real-time SAR processor prototype

Satellite on-board real-time SAR processor prototype

Virtual source aperture imaging for non-destructive testing

Synthetic aperture focusing of ultrasonic data from multilayered media using an omega-K algorithm

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