Rahim R. Rizi, Ph.D.
Professor of Radiology
Department: Radiology
Graduate Group Affiliations
Contact information
Department of Radiology
1 Founders
MRI Learning Center
3400 Spruce Street
Philadelphia, PA 19104-6100
1 Founders
MRI Learning Center
3400 Spruce Street
Philadelphia, PA 19104-6100
Office: 215-615-2426
Fax: 215-349-5115
Fax: 215-349-5115
Email:
rizi@uphs.upenn.edu
rizi@uphs.upenn.edu
Links
Functional and Metabolic Imaging Group at the University of Pennsylvania Department of Radiology
Functional and Metabolic Imaging Group at the University of Pennsylvania Department of Radiology
Education:
B.S. (Chemistry)
University of Isfahan, Iran, 1976.
M.S. (Physical Chemistry)
Western Illinois University, 1978.
Ph.D. (Physical Chemistry)
University of Iowa , 1983.
M.S. (Computer Science)
University of Pennsylvania , 1987.
Permanent linkB.S. (Chemistry)
University of Isfahan, Iran, 1976.
M.S. (Physical Chemistry)
Western Illinois University, 1978.
Ph.D. (Physical Chemistry)
University of Iowa , 1983.
M.S. (Computer Science)
University of Pennsylvania , 1987.
Description of Research Expertise
The Functional and Metabolic Imaging Group (FMIG) is dedicated to advancing the science of hyperpolarized magnetic resonance imaging (MRI) for the study of pulmonary and metabolic health. Our research spans fundamental sequence development to translational applications in patient care, with the goal of enabling earlier, more precise detection of disease and more effective monitoring of treatment response.Our current investigations focus on four interconnected research areas:
1) Next-generation hyperpolarized gas MRI: Developing and refining hyperpolarized 129Xe MRI methods to obtain quantitative, high-resolution maps of lung structure and function. These techniques provide novel biomarkers of ventilation, gas exchange, and microstructural integrity, enabling the detection of early, subtle pulmonary impairments not visible with conventional imaging.
2) Hyperpolarized 13C metabolic imaging: Designing and implementing real-time imaging approaches using hyperpolarized 13C-labeled metabolites (such as [1-13C]pyruvate) to investigate in vivo metabolism. This work supports new ways to assess lung perfusion, pulmonary pH, and abnormal metabolic pathways associated with conditions such as lung transplant rejection, cancer, and other pulmonary diseases where metabolic dysregulation plays a central role.
3)Innovative pulmonary function assessment: Pioneering MRI-based techniques to quantify ventilation dynamics, gas transfer efficiency, and regional lung mechanics, integrating imaging biomarkers with physiological metrics for a more complete understanding of lung health.
4) Rapid and efficient imaging sequences: Developing high-performance MRI pulse sequences and reconstruction algorithms tailored for hyperpolarized gases and metabolites, enabling high temporal and spatial resolution while maximizing polarization preservation.
Together, these efforts position the FMIG at the forefront of biomedical imaging and innovation, bridging physics, engineering, and clinical science to transform the evaluation of lung physiology and disease.
Selected Publications
Nomani A, Li G, Yousefi S, Wu S, Malekshah OM, Nikkhoi SK, Pourfathi M, Rizi R, Hatefi A: Gadolinium-labeled affibody-XTEN recombinant vector for detection of HER2+ lesions of ovarian cancer lung metastasis using quantitative MRI. J Control Release 337: 132-143, Sep 2021.Baron R, Kadlecek S, Loza L, Xin Y, Amzajerdian F, Duncan I, Hamedani H, Rizi R: Deriving Regionally Specific Biomarkers of Emphysema and Small Airways Disease Using Variable Threshold Parametric Response Mapping on Volumetric Lung CT Images. Acad Radiol 29 Suppl 2(Suppl 2): S127-S136, Feb 2022.
Hamedani H, Kadlecek S, Ruppert K, Xin Y, Duncan I, Rizi RR: Ventilation heterogeneity imaged by multibreath wash-ins of hyperpolarized 3 He and 129 Xe in healthy rabbits. J Physiol 599(17): 4197-4223, Sep 2021.
Ball L, Robba C, Herrmann J, Gerard SE, Xin Y, Mandelli M, Battaglini D, Brunetti I, Minetti G, Seitun S, Bovio G, Vena A, Giacobbe DR, Bassetti M, Rocco PRM, Cereda M, Rizi RR, Castellan L, Patroniti N, Pelosi P; Collaborators of the GECOVID Group: Lung distribution of gas and blood volume in critically ill COVID-19 patients: a quantitative dual-energy computed tomography study. Crit Care 25(1): 214, Jun 2021.
Habertheuer A, Ram C, Schmierer M, Chatterjee S, Hu R, Freas A, Zielinski P, Rogers W, Silvestro EM, McGrane M, Moore JS, Korutla L, Siddiqui S, Xin Y, Rizi R, Tao JQ, Kreisel D, Naji A, Ochiya T, Vallabhajosyula P.: Circulating Donor Lung-Specific Exosome Profiles Enable Noninvasive Monitoring of Acute Rejection in a Rodent Orthotopic Lung Transplantation Model. Transplantation 106(4): 754-766, Apr 2021.
Xin Y, Martin K, Morais CCA, Delvecchio P, Gerard SE, Hamedani H, Herrmann J, Abate N, Lenart A, Humayun S, Sidhu U, Petrov M, Reutlinger K, Mandelbaum T, Duncan I, Tustison N, Kadlecek S, Chatterjee S, Gee JC, Rizi RR, Berra L, Cereda M: Diminishing Efficacy of Prone Positioning With Late Application in Evolving Lung Injury. Crit Care Med 49(10): e1015-e1024, Oct 2021.
Ruppert K, Amzajerdian F, Xin Y, Hamedani H, Loza L, Achekzai T, Duncan IF, Profka H, Qian Y, Pourfathi M, Kadlecek S, Rizi RR: Investigating biases in the measurement of apparent alveolar septal wall thickness with hyperpolarized 129Xe MRI. Magn Reson Med 84(6): 3027-3039, Dec 2020.
Amzajerdian F, Ruppert K, Hamedani H, Baron R, Xin Y, Loza L, Achekzai T, Duncan IF, Qian Y, Pourfathi M, Kadlecek S, Rizi RR.: Measuring pulmonary gas exchange using compartment-selective xenon-polarization transfer contrast (XTC) MRI. Magn Reson Med 85(5): 2709-2722, Dec 2020.
Rizi RR, Hamedani H, Cereda M.: In Chronic Obstructive Pulmonary Disease Progression, Is It Airway Narrowing or Airway Loss? Am J Respir Crit Care Med 203(2): 154-155, Jan 2021.
Xin Y, Cereda M, Hamedani H, Martin KT, Tustison NJ, Pourfathi M, Kadlecek S, Siddiqui S, Amzajerdian F, Connell M, Abate N, Kajanaku A, Duncan I, Gee JC, Rizi RR: Positional Therapy and Regional Pulmonary Ventilation: High Resolution Alignment of Prone and Supine Computed Tomography Images in a Large Animal Model. Anesthesiology 133(5): 1093-1105, Nov 2020.
Pourfathi M, Xin Y, Rosalino M, Cereda M, Kadlecek S, Duncan I, Profka H, Hamedani H, Siddiqui S, Ruppert K, Chatterjee S, Rizi RR: Pulmonary pyruvate metabolism as an index of inflammation and injury in a rat model of acute respiratory distress syndrome. NMR Biomed 33(11): e4380, Nov 2020.
