Objective (s): Various iterative reconstruction algorithms in nuclear medicine have been introduced in the last three decades. For each new imaging system, it is wise to select appropriate image reconstruction algorithms and evaluate their performance. In this study, three approaches of image reconstruction were developed for a novel desktop open-gantry SPECT system, PERSPECT, to assess their p...

In this study, use of a helical orbit in performing a long object SPECT scan with parallel, cone, fan, rotated fan, varying focal-length cone, divergent, and astigmatic collimators is proposed. Sufficient-data scanning helical orbits for these collimation geometries are developed. Both singledetector system and multi-detector system are considered. In order to verify our orbit design requiremen...

We report a study of the original image reconstruction algorithm based on time-of-flight maximum-likelihood expectation–maximization (TOF MLEM), developed for total-body (TB) Jagiellonian PET (J-PET) scanners. The method is applicable to generic cylindrical or modular multilayer layouts and extendable multiphoton imaging. system response matrix (SRM) represented as set analytical functions, uni...

Abstract Digital rock is an emerging area of physics, which involves scanning reservoir rocks using X-ray micro computed tomography (XCT) scanners and it for various petrophysical computations evaluations. The acquired CT projections are used to reconstruct the attenuation maps rock. image reconstruction problem can be solved by utilization analytical (such as Feldkamp–Davis–Kress (FDK) algorit...

Zhou, Weihua, "Image reconstruction and imaging configuration optimization with a novel nanotechnology enabled breast tomosynthesis multi-beam X-ray system" (2012). Dissertations. Paper 540. Digital breast tomosynthesis is a new technology that provides three-dimensional information of the breast and makes it possible to distinguish the cancer from overlying breast tissues. We are dedicated to ...

Iterative image reconstruction algorithms have been widely used in the field of positron emission tomography (PET). However, such algorithms are sensitive to noise artifacts so that the reconstruction begins to degrade when the number of iterations is high. In this paper, we propose a new algorithm to reconstruct an image from the PET emission projection data by using the conditional entropy ma...

The main goal of SPECT imaging is to determine the distribution of injected activity inside patient’s body. However, due to photon attenuation, a quantitative study is encountered with remarkable error. Using Monte Carlo method, it is possible to find the most precise relationship between activity distribution and its projections. Therefore, it is impossible to create mathematical projections t...

The Compton camera is a gamma ray imaging device expected to provide clinically relevant images in the SPECT applications where collimated cameras are sub-optimal. Its performances depend not only on design of detection system but also choices related tomographic reconstruction. aim this work show that accuracy modelling acquisition largely influences quality images. For purpose, we restrict he...