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 an assistant professor at UT Southwestern. His research focuses on developing new algorithms to analyze 3D and 4D radiological and non-radiological images. He recently developed a new technique Advanced Cranial Curvature Estimation (ACCUREST) to evaluate images of pediatric patients with craniofacial differences.


Featured Publications LegendFeatured Publications

3D-Printed Models of Cleft Lip and Palate for Surgical Training and Patient Education.
Chou PY, Hallac RR, Shih E, Trieu J, Penumatcha A, Das P, Meyer CA, Seaward JR, Kane AA Cleft Palate Craniofac. J. 2018 Mar 55 3 323-327
Quantifying Normal Craniofacial Form and Baseline Craniofacial Asymmetry in the Pediatric Population.
Cho MJ, Hallac RR, Ramesh J, Seaward JR, Hermann NV, Darvann TA, Lipira A, Kane AA Plast. Reconstr. Surg. 2018 Mar 141 3 380e-387e
A Three-Dimensional Study of Midfacial Changes Following Le Fort II Distraction With Zygomatic Repositioning in Syndromic Patients.
Smartt JM, Campbell C, Hallac R, Alford J, Derderian CA J Craniofac Surg 2017 Sep
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
The role of Nasoalveolar molding: A 3D Prospective analysis.
Chou PY, Hallac RR, Ajiwe T, Xie XJ, Liao YF, Kane AA, Park YJ Sci Rep 2017 Aug 7 1 9901
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


Featured Books Legend Featured Books

19F NMR: Clinical and Molecular Imaging Applications. In Fluorine in Pharmaceutical and Medicinal Chemistry: From Biophysical Aspects to Clinial Applications