In a photoacoustic (PA) imaging system, the detectors are bandwidth-limited. Therefore, they capture PA signals with some unwanted ripples. This limitation degrades resolution/contrast and induces sidelobes artifacts in reconstructed images along axial direction. To compensate for limited bandwidth effect, we present signal restoration algorithm, where mask is designed to extract at absorber positions remove improves resolution contrast image. The restored can be considered as input of...

In this paper, the relationship between position of ultrasound transducers from photoacoustic source and reconstructed image is investigated. Our studies have shown that distance transducer its location specifically affects closely related to quality source. Also, we introduce a concept called blind angle for computed tomography (PACT) planar or circular limited-view geometry. Complete accurate equations are presented in paper all different 2D geometries. The main these spherically wave...

Circular photoacoustic tomography (C-PAT) arrangements are widely used in PAT systems. Many algorithms proposed for to reconstruct images such as delay and sum (DAS), universal back-projection (UBP), etc., all suffering from their own disadvantages. In this paper, overcome these limitations, we a fast uniform adapted (ADAS) filtered (F-ADAS) detectors with finite infinite bandwidth, respectively. Moreover, the edge uniformity index (EUI) metric was quantitative evaluation. Two cases 1)...

Among different transducer configurations of a photoacoustic (PA) imaging system, limited-view (e.g., planar and circular configurations) have more clinical applications. On the other hand, generated PA wave is bipolar. Therefore, qualifying physiological parameters would be challenging, especially in configuration. To tackle this issue, paper unipolar back-projection reconstruction algorithm presented. The proposed method uses initial signals derivatives to reconstruct image. numerical...

Reducing the number of acoustic detectors in a circular-view photoacoustic imaging system leads to cost reduction and increased efficiency. But reducing results appearing more streak artifacts reconstructed image. In this paper suppress artifacts, we proposed an artifact removal factor. The factor is combination edge detection image filter standard deviation that applied back-projected signals. To evaluate performance method, reduced transducers fifth minimum required number. Numerical have...

In this paper, we divide the imaging geometry of a photoacoustic computed tomography (PACT) structure that have circular and focused transducers positive or negative focus, into different zones varying resolution. With using presented analysis, it is possible to find maximum range in which system resolution at its best value, according device specifications. The following equations are used blind spot angles for each source point inside chamber. These important two reasons: first user can...

In circular photoacoustic computed tomography, for data acquisition, a single-element transducer rotates around the region of interest (ROI). Due to limited acceptance angle finite size transducer, reconstructed image becomes blurred, and tangential resolution/contrast degrades in off-center locations ROI. this paper, we propose compensation method which addition scanning, its center (with specific angles) at each detection point. The superposition these central rotations non-rotated mimics...

Circular full-view configuration of photoacoustic imaging systems (C-PAI) has many applications in biomedicine (e.g., breast and brain imaging). To obtain a high-quality reconstructed image, dense spatial sampling (a large number acoustic detectors) is needed, which makes the system expensive challenging. Unfortunately, by reducing samples, streak artifacts appear, degrade quality image. In this article, we propose spatial-domain factor to suppress enhance image sparse C-PAI system....

In this paper, we proposed an adapted coherent factor (ACF), which is applied to a circular scanning photoacoustic computed tomography (C-PACT) arrangement. For validation, ACF different reconstruction algorithms such as universal-back projection (UBP) and delay sum (ADAS) with two types of SNR levels (80 dB 20 dB) 2 detectors bandwidths (infinite bandwidth 2.25 MHz central frequency, 70% bandwidth). Simulation results indicate can improve the Full width at half maximum (FWHM) imaging system...

Among the different configurations of a photoacoustic imaging (PAI) system, planar configuration has many applications. Due to limited-view configuration, resolution and contrast system are low. To improve contrast, coherence factor (CF) can be applied reconstructed image. Although CF improves it causes missed data in In this paper, we proposed Hilbert-based (H-CF) method compensate for issue also increase contrast. Three numerical studies were conducted evaluate method's performance. The...

Abstract Circular-view (circular scan) photoacoustic computed tomography (PACT) with low-density detection points (DPs) is an efficient, high-speed, and inexpensive modality numerous (pre-) clinical applications. However, as the number of DPs decreases (decrease in A-lines), some unwanted streak artifacts appear reconstructed PACT image. Here, we present approach to address mentioned challenge enhance image contrast. In this method, several low-resolution-images (LRIs) are by employing a few...

For many years synthetic aperture ultrasound imaging has been developed for its quality and high-resolution images, but it would be desirable to exceed resolution limit. Structured illumination by transmitting a series of known grating patterns helps obtain higher information the sample in optical microscopy. However, there are challenges realize this idea imaging, regarding acoustic field manipulation difficulties transmissions. This paper presents method resolve structures with...

Circular-view detector configurations provide higher image quality in a photoacoustic (PA) imaging system than other configurations. The degrades, and streak artifacts appear the reconstructed as number of detectors decreases. Here, we present coherent compounding strategy for suppressing artifacts. Parts that refer to excited PA absorbers artifact are separable by reconstructing several sub-images combining images. numerical results showed presented method suppresses improves images...