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

Comparison of an unsupervised machine learning algorithm and surgeon diagnosis in the clinical differentiation of metopic craniosynostosis and benign metopic ridge.
Cho MJ, Hallac RR, Effendi M, Seaward JR, Kane AA Sci Rep 2018 Apr 8 1 6312
Field Distortions in MRI Caused by Stainless Steel Orthodontic Appliances at 1.5 T Using Permanent Magnets - A Head Phantom Study.
Wang ZJ, Park YJ, Morriss MC, Seo Y, Nguyen T, Hallac RR, Nava A, Chopra R, Chatzinoff Y, Price K, Rollins NK Sci Rep 2018 Apr 8 1 5706
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


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