Dr. Hallac has an extensive background in signal processing and image analysis, with specific training and expertise in diverse research areas. As a master’s student, he designed a single transmitter/multiple receiver Doppler ultrasound transducer to collect statistically different random signals to improve Doppler ultrasound velocity estimation, depending on the angle from which the sound is received. He expanded his research realm during his Ph.D. studies to include imaging of tumor microenvironment. He worked on multiple imaging modalities, including MRI, PET and BLI to noninvasively assess tumor oxygenation/vasculature and predict tumor response to radiation/chemotherapy. His expertise lies in both preclinical studies and clinical trials. During his research career, he collaborated with scientists and clinicians from various fields including plastic surgery, radiation oncology and internal medicine.

Dr. Hallac is currently an imaging scientist at Children's Medical Center and a clinical assistant professor at UT Southwestern. His research focuses on developing new algorithms to analyze 3D and 4D radiologic and non-radiologic images. He recently developed a new technique Automatic Curvature Estimation (ACCUREST) to evaluate images of pediatric patients with craniofacial differences.


Featured Publications LegendFeatured Publications

Incorporating Oxygen-Enhanced MRI into Multi-Parametric Assessment of Human Prostate Cancer.
Zhou H, Hallac RR, Yuan Q, Ding Y, Zhang Z, Xie XJ, Francis F, Roehrborn CG, Sims RD, Costa DN, Raj GV, Mason RP Diagnostics (Basel) 2017 Aug 7 3
Automated cleft speech evaluation using speech recognition.
Vucovich M, Hallac RR, Kane AA, Cook J, Van'T Slot C, Seaward JR J Craniomaxillofac Surg 2017 May
Dynamic facial asymmetry in patients with repaired cleft lip using 4D imaging (video stereophotogrammetry).
Hallac RR, Feng J, Kane AA, Seaward JR J Craniomaxillofac Surg 2016 Nov
Metopic "ridge" vs. "craniosynostosis": Quantifying severity with 3D curvature analysis.
Cho MJ, Kane AA, Seaward JR, Hallac RR J Craniomaxillofac Surg 2016 Jul
Liquid Latex Molding: A Novel Application of 3D Printing to Facilitate Flap Design.
Cho MJ, Kane AA, Hallac RR, Gangopadhyay N, Seaward JR Cleft Palate Craniofac. J. 2016 May
A role for dynamic contrast-enhanced magnetic resonance imaging in predicting tumour radiation response.
Hallac RR, Zhou H, Pidikiti R, Song K, Solberg T, Kodibagkar VD, Peschke P, Mason RP Br. J. Cancer 2016 May 114 11 1206-11
Postural orientation and equilibrium processes associated with increased postural sway in autism spectrum disorder (ASD).
Wang Z, Hallac RR, Conroy KC, White SP, Kane AA, Collinsworth AL, Sweeney JA, Mosconi MW J Neurodev Disord 2016 8 43
Evaluation of tumor ischemia in response to an indole-based vascular disrupting agent using BLI and (19)F MRI.
Zhou H, Hallac RR, Lopez R, Denney R, MacDonough MT, Li L, Liu L, Graves EE, Trawick ML, Pinney KG, Mason RP Am J Nucl Med Mol Imaging 2015 5 2 143-53
Simultaneous measurement of tissue oxygen level-dependent (TOLD) and blood oxygenation level-dependent (BOLD) effects in abdominal tissue oxygenation level studies.
Ding Y, Mason RP, McColl RW, Yuan Q, Hallac RR, Sims RD, Weatherall PT J Magn Reson Imaging 2013 Nov 38 5 1230-6