Benjamin Ziemer
A5001882236- Neutrino Physics Research
- Advanced Radiotherapy Techniques
- Particle physics theoretical and experimental studies
- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Brain Metastases and Treatment
- Cardiac Imaging and Diagnostics
- Glioma Diagnosis and Treatment
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Biblical Studies and Interpretation
- Advanced MRI Techniques and Applications
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- Radiomics and Machine Learning in Medical Imaging
- Meningioma and schwannoma management
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Coronary Interventions and Diagnostics
- Lung Cancer Diagnosis and Treatment
- Archaeology and Historical Studies
- Cerebrovascular and Carotid Artery Diseases
- Prostate Cancer Diagnosis and Treatment
- Head and Neck Cancer Studies
- Ancient Egypt and Archaeology
University of California, San Francisco
2019-2024
University of California, Irvine
2005-2017
University of California, San Diego
2016-2017
Irvine University
2014-2015
University of California System
2015
Instituto Benjamin Constant
2015
Minerva Foundation
2013
University of Wisconsin–Madison
2001
Charged pion production via charged-current ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ interactions on plastic scintillator (CH) is studied using the MINERvA detector exposed to NuMI wideband neutrino beam at Fermilab. Events with hadronic invariant mass $W<1.4\text{ }\text{ }\mathrm{GeV}$ and $W<1.8\text{ are selected in separate analyses: lower $W$ cut isolates single production, which expected occur primarily through $\mathrm{\ensuremath{\Delta}}(1232)$ resonance, while results from higher...
Neutrino-induced coherent charged pion production on nuclei νμA→μ(±)π(∓)A is a rare, inelastic interaction in which small squared four-momentum |t| transferred to the recoil nucleus, leaving it intact reaction. In scintillator tracker of MINERvA, we remove events with evidence particles from nuclear breakup and reconstruct final-state muon. We select low isolate sample rich candidates. By selecting events, produce model-independent measurement differential cross section for scattering...
To suggest an attention-aware, cycle-consistent generative adversarial network (A-CycleGAN) enhanced with variational autoencoding (VAE) as a superior alternative to current state-of-the-art MR-to-CT image translation methods.An attention-gating mechanism is incorporated into discriminator encourage more parsimonious use of parameters, whereas VAE enhancement enables deeper discrimination architectures without inhibiting model convergence. Findings from 60 patients head, neck, and brain...
Abstract Background Adverse radiation effect (ARE) following stereotactic radiosurgery (SRS) for brain metastases is challenging to distinguish from tumor progression. This study characterizes the clinical implications of radiologic uncertainty (RU). Methods Cases reviewed retrospectively at a single-institutional, multi-disciplinary SRS Tumor Board between 2015–2022 RU were identified. Treatment history, diagnostic or therapeutic interventions performed upon resolution, and development...
We present measurements of $\nu_{\mu}$ charged-current cross section ratios on carbon, iron, and lead relative to a scintillator (CH) using the fine-grained MINERvA detector exposed NuMI neutrino beam at Fermilab. The utilize events energies $2<E_{\nu}<20~GeV$, with $\left< E_{\nu}\right>=8~GeV$, which have reconstructed $\mu^{-}$ scattering angle less than $17^\circ$ extract inclusive total sections as function energy $E_{\nu}$ flux-integrated differential respect Bjorken scaling variable...
A study of charged-current muon neutrino scattering on hydrocarbon in which the final state includes a and proton no pions is presented. Although this signature has topology quasielastic from neutrons, event sample contains contributions both inelastic processes where are absorbed nucleus. The analysis accepts events with production angles up to 70$^{\circ}$ kinetic energies greater than 110 MeV. extracted cross section, when based completely hadronic kinematics, well-described by simple...
Single neutral pion production via muon antineutrino charged-current interactions in plastic scintillator (CH) is studied using the \minerva detector exposed to NuMI low-energy, wideband beam at Fermilab. Measurement of this process constrains models nuclei, which important because neutral-current analog a background for $\bar{\nu}_e$ appearance oscillation experiments. The differential cross sections $\pi^0$ momentum and angle, events with single observed no charged pions, are presented...
The first direct measurement of electron neutrino quasielastic and quasielasticlike scattering on hydrocarbon in the few-GeV region incident energy has been carried out using MINERvA detector NuMI beam at Fermilab. flux-integrated differential cross sections production angle, energy, Q^{2} are presented. ratio quasielastic, section for ν_{e} with that similarly selected ν_{μ}-induced events from same exposure is used to probe assumptions underpin conventional treatments charged-current...
The MINERvA collaboration operated a scaled-down replica of thesolid scintillator tracking and sampling calorimeter regions the detector in hadron test beam at Fermilab Test Beam Facility. This paper reports measurements with samples protons, pions, electrons from 0.35 to 2.0 GeV/c momentum. calorimetric response is obtained these data. A measurement parameter Birks׳ law an estimate efficiency are extracted proton sample. Overall data well described by Geant4-based Monte Carlo simulation...
The authors' objective was to examine the safety and efficacy of salvage intracranial cesium-131 brachytherapy in combination with resection recurrent brain tumors.
Purpose Single‐isocenter, volumetric‐modulated arc therapy ( VMAT ) stereotactic radiosurgery SRS for multiple brain metastases (multimets) can deliver highly conformal dose distributions and reduce overall patient treatment time compared to other techniques. However, planning multimet cases is complex due variability in numbers sizes of metastases, as well their relative proximity organs‐at‐risk OAR s). The purpose this study was automate the through a knowledge‐based KBP approach that...
The authors previously evaluated risk and time course of adverse radiation effects (AREs) following stereotactic radiosurgery (SRS) for brain metastases, excluding lesions treated after prior SRS. In the present analysis they focus specifically on single-fraction salvage SRS to metastases with or hypofractionated (HFSRS), evaluating freedom from progression (FFP) AREs.Brain September 1998 May 2019 HFSRS were analyzed. Serial follow-up magnetic resonance imaging (MRI) surgical pathology...
Purpose To retrospectively validate a first-pass analysis (FPA) technique that combines computed tomographic (CT) angiography and dynamic CT perfusion measurement into one low-dose examination. Materials Methods The study was approved by the animal care committee. FPA validated in six swine (mean weight, 37.3 kg ± 7.5 [standard deviation]) between April 2015 October 2016. Four to five intermediate-severity stenoses were generated left anterior descending artery (LAD), 20 contrast...
Computed tomographic (CT) angiography is an important tool for the evaluation of coronary artery disease but often correlates poorly with myocardial ischemia. Current dynamic CT perfusion techniques can assess ischemia have limited accuracy and deliver high radiation dose. Therefore, accurate, low-dose, technique needed.A total 20 contrast-enhanced volume scans were acquired in 5 swine (40±10 kg) to generate images. Varying degrees stenosis induced using a balloon catheter proximal left...
Accurate energy calibration is critical for the application of energy-resolved photon-counting detectors in spectral imaging. The aim this study to investigate feasibility response and characterization a detector using x-ray fluorescence. A comprehensive Monte Carlo simulation was performed Geant4 Application Tomographic Emission (GATE) optimal technique fluorescence calibration. Simulations were conducted 100 kVp tungsten-anode spectra with 2.7 mm Al filter single pixel cadmium telluride...
Molecularly imprinted films of poly(acrylic acid) (PAA) have been coated onto n-CdSe in order to make the band-edge photoluminescence (PL) semiconductor respond selectively imprinting analyte. This strategy has implemented using PAA deposited presence ammonia and trimethylamine analytes. characterized by IR spectroscopy, which indicates that binding either analyte nearly reversibly deprotonates polymer carboxylic acid groups. PL measurements suggest coatings serve as sieves for selective...
Misalignment to the incorrect vertebral body remains a rare but serious patient safety risk in image-guided radiotherapy (IGRT).Our group has proposed that an automated image-review algorithm be inserted into IGRT process as interlock detect off-by-one errors. This study presents development and multi-institutional validation of convolutional neural network (CNN)-based approach for such using image data from planar stereoscopic x-ray system.X-rays digitally reconstructed radiographs (DRRs)...