Liver MRI in 30 minutes
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1 X Liver MRI in 30 minutes SCBT/MR Annual Meeting Salt Lake City September 18, 2016 Scott B. Reeder, MD, PhD Department of Radiology University of Wisconsin Madison, WI
2 Disclosures University of Wisconsin-Madison receives research support from GE Healthcare, and Bracco Diagnostics Founder Calimetrix, LLC Shareholder Elucent Medical Consulting - Parexel International
3 Overview: Standard Abdominal Protocol Coronal T2w SSFSE (1-2 BH) T1w In/Out Phase (1-2 BH) Injection Pre-contrast 3D-T1w (1 BH) Late Arterial 3D-T1w (1 BH) Portal Venous 3D-T1w (1 BH) Axial T2w FSE (3-4 min) Equilibrium 3D-T1w (1 BH) DWI (2-3 BH) Dynamic T1w Imaging (5-7 min) b=0-50 b= ADC
4 Localizers Three plane localizers Perform during same breath-holding maneuver Practice for patient, more accurate prescription Help determine how long patient can hold breath Check coil position to ensure well positioned SSFSE (HASTE) SSFP (FIESTA, true-fisp, BFFE) Contain a great deal of diagnostic information Don t forget to review Corner shots!
5 Signal T2 Weighted Imaging Fluid Tumor Liver Echo Time (TE)
6 Coronal SSFSE: 1-2 breath-holds High resolution Rapid, robust overview of anatomy and pathology Surgeons like the coronal view Coronal useful to prescribe axial volumes Should it replace conventional T2w-FSE?? Altered contrast Extended echo train = mix of spin-echoes & stimulated echoes Metastatic disease difficult to visualize Great for cysts and hemangiomas
7 Examples Hemangioma and Renal Cyst Patient 1 Patient 2 Patient 3 Biliary cystadenoma Caroli s disease
8 Case: Metastatic Adenocarcinoma T2w FSE with FS T2w SSFSE DWI (b=500) Metastases Inconspicuous On T2w SSFSE Is this a problem??
9 Hepatic metastasis, rectal CA Precontrast Arterial Delayed T2 FS DWI Case, courtesy Bobby Kalb, MD, University of Arizona
10 21 yo F, intrahepatic cholangioca Precontrast Arterial Delayed T2 Ax MRCP Case, courtesy Bobby Kalb, MD, University of Arizona
11 Fat-Iron Sensitive Sequences In-phase and opposed-phase Liver Detection (qualitative) of hepatic steatosis Mass-mimicking steatosis Focal fat Focal sparing Mass characterization HCC Hepatic adenoma Angiomyolipoma Adrenal masses Renal masses (AML, RCC)
12 Detection of Fat with MRI: In and Opposed Phase (2-point Dixon) Opposed-Phase (W-F) In-Phase (W+F)
13 Case : Renal Mass Histology: Clear Cell Renal Cell Carcinoma
14 Case: Hemosiderosis Axial out-of-phase Axial in-phase Axial T2w FSE Coronal T2w SSFSE
15 Enhancement Phases of Enhancement: Extracellular Contrast Agents HA PV Liver Tumor Time inject
16 Enhancement Phases of Enhancement: Extracellular Contrast Agents Arterial Late Phase Arterial Phase Portal Venous HA PV Liver Tumor Time Pre inject Late HAP PVP Equilibrium
17 Patient 3 Patient 2 Patient 1 Cases: Contrast Enhanced T1w Normal Focal Nodular Hyperplasia Renal Cell Carcinoma
18 Diffusion Weighted Imaging Unrestricted (fluid) Larger ADC (more signal loss) Restricted (cells) Smaller ADC (less signal loss)
19 DWI: Optional Sequence Suppresses tissues with freely diffusing water Increased conspicuity: lesions with high cellularity Applications Detection and characterization of malignancy helpful for metastatic disease in the liver Not helpful for HCC Pearls: b = 0 is just T2-weighted S=S o e -TE/T2 b > 0 is both T2- & diffusion-weighted S=S o e -TE/T2 e -badc
20 DWI: Optional Sequence Image quality insufficiently reliable Used with echo planar imaging Distortion, signal dropout (left lobe of liver) Failed fat suppression Problem on all vendors Cannot rely on this sequence alone for detection Pearl: important, but least reliable. Perform last!
21 Cases: 58yo M with Colorectal Cancer 2x10-3 mm 2 /s Restricted diffusion: high cellularity Axial DWI (b=500) ADC Map (mm 2 /s) 0 mm 2 /s
22 Abdominal MRI: Current Protocol Dynamic T1w CE-MRI - Detect lesions - Characterize - Vascular T2w MRI - Detect lesions - Characterize - Biliary, renal T1w Fat/Iron Sensitive - liver - pancreas - adrenal glands DWI - Detect lesions - Characterize - Diffuse liver dz Neuroendocrine Mets MRCP - Biliary dz - Pancreas - Surgical Cx s Pancreatic AdenoCA
23 Enhancement Phases of Enhancement: Extracellular Contrast Agents Late Arterial Phase Portal Venous HA PV Liver Tumor Equilibrium Time inject 3-4 minutes
24 Time Resolved MRI: Interleaved Variable Density Injection 24s Pre-Contrast T1 # 1 # 2 # 3 # 4 # 5 Portal Venous Phase Equilibrium Phase Dynamic IVD k y k z
25 Time Resolved MRI: Interleaved Variable Density 4s temporal resolution Focal Nodular Hyperplasia x 4
26 Data Acquisition: 3D Cartesian High Temporal & Spatial Resolution 2.0 mm isotropic 40 (L/R) x 32 (A/P) x 20 (S/I) cm sec/frame 3x 20s breath-holds 3T, GE Discovery MR channel Torso Phase 5, end of 1 st BH Phase 6, start of 2 nd BH Wang et al ISMRM 2012, 3867
27 Basic Liver MRI: Current Protocol Contrast Localizers (1 min) T1w IOP (1 min) T2W (1 min) DWI (3-5min) 3D T1w (3-4 min) ~20-25 minutes
28 Basic Liver MRI: Suggested Approach DWI (b=0) T2 weighted Contrast image! Localizers (1 min) Dual Echo (Dixon) T1w IOP 3D T1w DCE-MRI (1 min) (3 minutes) T2W (1 min) Advanced DWI (b=500) T2w + DWI DWI (1 breath-hold) (3-5min) 3D T1w (3-4 min) Water Fat < 5 minutes Combine In-phase Dixon Opposed fat-water Phase imaging with 3D CE-MRI Combine DWI with T2 weighted imaging** Eliminate localizers**
29 Thank you! Alex Frydrychowicz, MD Scott Nagle, MD, PhD Jeff Weinreb, MD Claude Sirlin, MD Grant Support WARF Accelerator NIH: R01 DK R01 DK R01 DK RC1 EB010384
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