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We compared denoising methods for Diffusion-Weighted Imaging (DWI) of phantoms acquired on a low-field MR-Linac to determine which method best preserves Apparent Diffusion Coefficient (ADC) accuracy and image feature detection. Our goal was to quantify image...

Ultra-high dose rate (UHDR) beams (40Gy/s) compromise the accuracy of conventional reference ion chambers (ICs) due to saturation effects. The Exradin A30 is an ultra-thin parallel-plate IC featuring a 0.3 mm nominal electrode spacing to enhance the charge co...

Routine radiation therapy machine quality assurance (QA) relies on multiple independent devices and subjective manual measurements, which can limit efficiency and sensitivity to small mechanical deviations. The purpose of this work was to quantitatively evalu...

Treatment planning for pancreatic SBRT remains challenging due to proximity and overlap of the target with the critical organs-at-risk (OARs). This study uses RapidPlan-predicted dose volume histograms (DVHs) to guide treatment planning in Monaco.

Treatment planning for malignant pleural mesothelioma (MPM) is challenging due to target geometry and organ-at-risk sparing requirements. This study uses RapidPlan-predicted dose volume histograms (DVHs) to guide Monaco planning for TrueBeam and Versa deliver...

Sentinel lymph node biopsy (SLNB) in melanoma utilizes preoperative lymphoscintigraphy +/- SPECT/CT for accurate identification of draining lymph nodes for surgical planning. However, SPECT/CT imaging is time consuming and is often located in different depart...

To integrate the first nozzle-mounted, quad-camera prompt gamma imaging (PGI) system on a clinical proton therapy gantry and to evaluate its efficacy for proton range verification under realistic treatment delivery conditions.

Quantitative SPECT imaging of the alpha-emitters Ac-225 and Pb-212 is fundamentally limited by a low count rate and high-energy photon emissions that produce collimator penetration, septal scatter, and detector backscatter within clinically used photopeak win...

To demonstrate a novel software package that will generate two- dimensional radiation field images and dose profiles of known characteristics for calibration of radiation therapy QA devices.

Slow energy switching remains a limitation in proton therapy. This study aims to design and optimize an energy degrader system to accelerate layer-to-layer dose delivery in compact proton therapy systems, thereby improving treatment efficiency, outcomes, and...

Automation in external beam radiotherapy chart checks improves standardization, efficiency, and error reduction. Our academic institution, consisting of approximately 200 users over 7 campuses, partnered with a vendor to integrate institution-developed automa...

To evaluate a novel dual-mode handheld gamma camera (RAVIN, M3D Inc.) utilizing coded aperture and Compton imaging for clinical radiopharmaceutical applications.

Secondary radiation from proton therapy can induce activation in beamline components, range shifters, and phantoms/patients. Rapid identification and localization of activated regions are critical for radiation safety, compliance, and workflow efficiency. We...

To provide AAPM members with a centralized, authoritative, and continuously updated web-based resource for obtaining beam quality conversion factors, kQ, and other data needed to realize absorbed dose measurements using the AAPM TG-51 protocol.

Ionization chambers represent the gold standard for clinical dosimetry; however, they suffer from severe ion recombination losses at the ultra-high dose rates (UHDR) characteristic of FLASH radiotherapy. This study evaluates the new commercial Exradin A30 par...

Photon-counting-detector (PCD) CT acquires multi-energy data in a single scan, enabling quantitation of electron density (ρe) and effective atomic number (Zeff). This study assessed the performance of PCD-CT for ρe and Zeff mapping across different phantom si...

While AAPM Working Group Report 438 provides essential guidance for business continuity planning after a cyberattack, preventing attacks remains the highest priority. Medical physicists need practical, immediately implementable prevention strategies and must...

To evaluate a novel dual-mode handheld gamma camera (RAVIN, M3D Inc.) utilizing coded aperture and Compton imaging for clinical radiopharmaceutical applications.

Quantitative 99mTc-sestamibi SPECT/CT is routinely used to distinguish benign kidney tumors from renal cell carcinoma. Standard clinical acquisitions typically use 360° orbits. However, a 180° posterior orbit can reduce scan time and patient discomfort. This...

Stopping-power ratio (SPR) is used in proton therapy to calculate the radiation dose distributions. SPR depends on tissue composition and can be calculated using multi-energy CT. This study compares the accuracy of SPR calculated using energy-integrating dete...

Pediatric central nervous system (CNS), peri-cranial, and ocular tumors pose significant challenges for radiation delivery due to complex target geometries, proximity to critical organs at risk, and heightened sensitivity to radiation-induced toxicity. Proton...

Iatrogenic cognitive deficits are a major concern in neuro-radiotherapy, especially in pediatric cases. Compared to X-ray treatment modalities, proton and ion beam therapies show improved sparing of cognitive functions, for which optimal neuronal dendritic br...

The purpose of this study was to test the ability of a portable gamma camera capable of imaging gammas from 30 – 600 keV gammas to produce 3D imaging and activity quantification of radiopharmaceutical distributions for RPT verification and dosimetry.

To develop FAST-X to deliver ultra-high dose-rate (UHDR) irradiation for complex cranial targets.

Quantitative Lu-177 SPECT imaging requires balancing statistical precision with clinically feasible acquisition times. Conventional reconstruction relies on triple-energy-window (TEW) scatter correction and is therefore effectively limited to the 208 keV phot...