Ahmad Parvinian

ORCID: 0000-0001-6427-7007
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Research Areas
  • Liver Disease and Transplantation
  • Liver Disease Diagnosis and Treatment
  • Organ Transplantation Techniques and Outcomes
  • Hepatocellular Carcinoma Treatment and Prognosis
  • Renal cell carcinoma treatment
  • Appendicitis Diagnosis and Management
  • Venous Thromboembolism Diagnosis and Management
  • Liver physiology and pathology
  • Cholangiocarcinoma and Gallbladder Cancer Studies
  • Gallbladder and Bile Duct Disorders
  • Vascular Anomalies and Treatments
  • Abdominal vascular conditions and treatments
  • Radiomics and Machine Learning in Medical Imaging
  • Folate and B Vitamins Research
  • Radiation Dose and Imaging
  • Pulmonary Hypertension Research and Treatments
  • Advanced X-ray and CT Imaging
  • Transplantation: Methods and Outcomes
  • MRI in cancer diagnosis
  • COVID-19 and healthcare impacts
  • Tuberous Sclerosis Complex Research
  • Parathyroid Disorders and Treatments
  • Vascular Malformations and Hemangiomas
  • Medical Imaging and Pathology Studies
  • Traumatic Brain Injury and Neurovascular Disturbances

Mayo Clinic in Arizona
2017-2024

Mayo Clinic
2017-2024

WinnMed
2021-2024

Mayo Clinic in Florida
2019

University of Illinois Chicago
2012-2016

University of Illinois Hospital & Health Sciences System
2013-2016

Illinois College
2014-2015

University of Illinois Urbana-Champaign
2012-2015

University of Chicago Medical Center
2012

To identify liver tumor characteristics associated with low (<10%), intermediate (10%-20%), and high (>20%) lung shunt fraction (LSF) at technetium 99m ((99m)Tc) macroaggregated albumin (MAA) imaging performed before yttrium 90 ((90)Y) radioembolization (RE).In this single-center retrospective study, 141 patients (70 hepatocellular carcinoma [HCC], 71 other tumors; 95 men, 45 women; median age, 61 years) underwent mapping arteriography (99m)Tc-MAA LSF calculation (90)Y RE from 2006 to 2012....

10.1148/radiol.14131969 article EN Radiology 2014-02-17

Abstract Background Computed tomography (CT) is routinely used to guide cryoablation procedures. Notably, CT‐guidance provides 3D localization of cryoprobes and can be delineate frozen tissue during ablation. However, metal‐induced artifacts from ablation probes make accurate probe placement challenging degrade the ice ball conspicuity, which in combination could lead undertreatment potentially curable lesions. Purpose In this work, we propose an image‐based neural network (CNN) model for...

10.1002/mp.16980 article EN Medical Physics 2024-02-14

Background and rationale for the study. The Model End Stage Liver Disease (MELD) score has not been derived validated emergent transjugular intrahepatic portosystemic shunt (TIPS) population. We sought to identify predictive factors survival among TIPS patients, substantiate MELD outcomes prognostication in this Results. 101 patients with acute life threatening variceal hemorrhage underwent (defined by failed endoscopic therapy active bleeding, hemoglobin drop, ≥ 2-unit transfusion...

10.1016/s1665-2681(19)31278-5 article EN cc-by-nc-nd Annals of Hepatology 2015-05-01

This study was performed to assess the safety, efficacy, and clinical outcomes of transjugular intrahepatic portosystemic shunt (TIPS) creation for treatment medically refractory ascites identify prognostic factors response, morbidity, mortality. MATERIALS AND METHODSIn this retrospective study, 80 patients (male:female, 52:28; mean age, 56 years; Model End-Stage Liver Disease [MELD] score, 15.1) who underwent elective TIPS between 1999-2012 were studied.A medical record review data on...

10.5152/dir.2013.13131 article EN Diagnostic and Interventional Radiology 2013-09-20

11C-Choline PET/CT for Detection and Localization of Parathyroid AdenomasAhmad Parvinian1, Erica L. Martin-Macintosh1, Ajit H. Goenka1, Jolanta M. Durski1, Brian P. Mullan1, Brad J. Kemp1 Geoffrey B. Johnson1Audio Available | Share

10.2214/ajr.17.18312 article EN American Journal of Roentgenology 2017-11-15

Purpose To quantify the correlation between doxorubicin (DOX) delivery and tumor necrosis after drug-eluting bead (DEB) transarterial chemoembolization (TACE). Materials Methods In this animal care committee-approved study, New Zealand white rabbit VX2 liver tumors were treated transarterially with DOX-loaded 70-150-μm DEBs in five treatment groups varying drug doses: sham (saline), 0 mg, 12.5 25 37.5 mg. DEB TACE was followed by 3- 7-day sacrifice, harvest, sectioning. Drug assessed using...

10.1148/radiol.2016152099 article EN Radiology 2016-03-11

Imaging surveillance and multidisciplinary conference (MDC) review can potentially improve survival in patients with hepatocellular carcinoma (HCC) by increasing access to liver transplantation. Geographic disparities donor organ availability may reduce this benefit. This study evaluated the impact of HCC on use curative therapies a region long transplant waiting times.167 were retrospectively studied. Subjects had an established diagnosis or diagnosed during hepatology follow-up. Collected...

10.1016/s1665-2681(19)31318-3 article EN cc-by-nc-nd Annals of Hepatology 2013-09-01

The purpose of this article is to characterize the temporal evolution and clinical impact laboratory liver function parameters after transjugular intrahepatic portosystemic shunt (TIPS) creation.In single-institution retrospective study, 157 patients (98 men 59 women; median age, 55 years) underwent TIPS between 2000 2012 had 1-month hepatobiliary follow-up. Medical record review was used compare baseline, peak, low bilirubin, aspartate aminotransferase (AST), alanine (ALT), alkaline...

10.2214/ajr.13.12232 article EN American Journal of Roentgenology 2014-11-21

The purpose of this study was to assess the efficacy and safety flow-directed catheter thrombolysis for treatment submassive pulmonary embolism (PE).In single-institution retrospective study, 19 patients (nine men 10 women; mean age [± SD], 54 ± 13 years) with PE underwent catheter-directed between 2009 2013. Presenting symptoms included dyspnea in 18 (95%) cases. Submassive diagnosed by CT arteriography right ventricular strain. bilateral 17 (89%) unilateral two (11%) Thrombolysis performed...

10.2214/ajr.13.11366 article EN American Journal of Roentgenology 2014-05-21

We aimed to assess the safety, efficacy, and clinical outcomes of splenic artery embolization (SAE).A total 50 patients (male:female, 33:17; mean age, 49 years) who underwent SAEs between 1998 2011 were retrospectively studied. The procedure indications included aneurysm or pseudoaneurysm (n=15), gastric variceal hemorrhage preoperative reduction surgical blood loss (n=9), other (n=11). In total, 22 procedures elective, 28 urgent emergent. embolic agents coils (n=50), gelatin sponges...

10.4261/1305-3825.dir.5895-12.1 article EN Diagnostic and Interventional Radiology 2012-01-01

Percutaneous thoracic duct embolization (TDE) is a safe, effective, and minimally invasive option for treating chylothorax. A recent report demonstrated the feasibility of ultrasound-guided intranodal lymphangiography as an alternative to pedal visualization duct, promising relative technical ease decreased procedure time TDE.We case postoperative bilateral chylothorax treated with followed by TDE.Intranodal resulted in rapid opacification abdominal lymphatics, permitting technically...

10.1002/hed.23425 article EN Head & Neck 2013-07-12

Hemobilia, or hemorrhage within the biliary system, is an uncommon form of upper gastrointestinal (GI) bleeding that presents unique diagnostic and therapeutic challenges. Most cases are result iatrogenic trauma, although accidental trauma a variety inflammatory, infectious, neoplastic processes have also been implicated. Timely diagnosis can often be difficult, as classic triad GI hemorrhage, colic, jaundice present in minority cases, there may considerable delay onset after initial injury....

10.1148/rg.2021200192 article EN Radiographics 2021-05-01

Purpose. To elucidate the impact of right atrial (RA) pressure on early mortality after transjugular intrahepatic portosystemic shunt (TIPS). Material and methods. In this single institution retrospective study, 125 patients (M:F = 75:50, mean age 55 years) who underwent TIPS with recorded intra-procedural RA pressures between 1999-2012 were studied. Demographic (age, gender), liver disease (Child-Pugh, Model for End Stage Liver Disease or MELD score), procedure (indication, urgency, Stent...

10.1016/s1665-2681(19)30848-8 article EN cc-by-nc-nd Annals of Hepatology 2014-07-01

Use of oral sorafenib, an antiangiogenic chemotherapeutic agent for hepatocellular carcinoma (HCC), is limited by unfavorable side effect profile. Transarterial chemoembolization (TACE) employs targeted intravascular drug administration, and has potential as a novel sorafenib delivery method to increase tumoral concentrations reduce systemic levels. This study aimed discern the pharmacokinetics TACE in rabbit VX2 liver tumor model.A 3 mg/kg dose ethiodized oil emulsion was delivered via...

10.5152/dir.2014.14394 article EN Diagnostic and Interventional Radiology 2015-04-02
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