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Fast and accurate lost radioactive source positioning is of critical importance for the prevention of radiation damage in the accident. Traditional instruments with low detection efficiency cost lots pf time and energy, and may lead to harms to the operator's health. A portable detector to directly determine the incident angle of gamma rays is promising for the homeland security applications. In this...
Proton therapy is superior to conventional radiation therapy due to dose deposition sharply increasing at Bragg peak. However, an uncertainty in Bragg peak position as large as 15 mm could occur due to a variety of uncertainties in proton therapy treatment delivery. One solution is to monitor the treatment during delivery by prompt gamma imaging. Pencil beam scanning mode is one of the widely adopted...
For a multi-pinhole SPECT system, it is important to choose an optimal scanning orbit to fulfill the sampling completeness requirement. In this study, we propose a novel four-degree-of-freedom (4-DOF) orbit which combines a conventional helical scanning path and a superimposed periodic reciprocating 3×3-pioint shift movement in transaxial plane. An Orlov-sphere-based numerical evaluation method was...
In order to develop animal SPECT imaging technology with low cost, we propose a dedicated multi-pinhole collimator design scheme on a clinical SPECT scanner to achieve high resolution. Based on the proposed design one can also optimize current system design for different application purposes. This work is focused on achieving half-mm SPECT imaging resolution on a single-head clinical SPECT scanner...
In this study we investigate the feasibility of performing small animal SPECT imaging on a clinical SPECT scanner with a dedicate pinhole collimator. Analytical formulae are used to calculate spatial resolution and absolute sensitivity given a pinhole collimator design scheme. Two optimal pinhole designs are proposed in terms of achieving the best trade-off between spatial resolution and absolute...
We developed SPECT imaging capability on an animal PET scanner by placing a slit-slat collimator inside the PET detector gantry. To perform in vivo animal imaging with minimal gravity induced animal motion, we investigated the performance of hybrid rotation-translation (HRT) tomographic scan scheme in this paper. Three evaluation indices, i.e. sampling completeness (SC), sensitivity, and directional...
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