ABDOMINAL DIFFUSION WEIGHTED MR
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1 ABDOMINAL DIFFUSION WEIGHTED MR Frank Miller, M.D. FACR Professor of Radiology Chief, Body Imaging Section Medical Director, MR Imaging Northwestern University Feinberg School of Medicine
2 DISCLOSURES No disclosures related to presentation
3 OBJECTIVES Demonstrate utility of DWI in abdomen Show advantages and limitations of DWI
4 ORGANS Liver Pancreas Adrenal Kidney Lymph nodes/peritoneum Problem-based approach and not able to cover nearly everything
5 DIFFUSION WEIGHTED IMAGING Used in neuroimaging for many years Used routinely in our body MR imaging practice Recommend starting DWI for abdominal applications if not already doing it Need to recognize the strengths and limitations
6 DIFFUSION WEIGHTED IMAGING Does not require contrast helpful when renal dysfunction and concern of NSF or allergy Relatively quick to perform Provides functional information in addition to anatomic Improved lesion conspicuity-better than T2 Best sequence for lymph node detection Some HCC (especially infiltrative lesions) and metastases better seen on DWI than on contrast-enhanced MR
7 IMPROVED CONSPICUITY: LIVER PECOMA b50 b500 ADC T1WI post
8 SOMETIMES LESS CONSPICUOUS HCC Arterial phase Delayed b500 ADC
9 DWI Normal cells have water mobility differences Theory-tumors less water mobility and therefore restricted diffusion: lower ADC Apparent diffusion coefficient (ADC): measure of diffusion which removes the T2 effects lesion which is bright on DWI may relate to T2 shine through and are bright on ADC map unlike true diffusion which is dark on ADC
10 WHICH B VALUE SHOULD YOU USE? b value-strength of diffusion sensitizing gradient No consensus on b values for abdomen-probably best between 0 and 1000 s/mm 2 At least 2 b values if calculating ADC We use 50, 400/500 and 800 s/mm 2
11 LOW B VALUE IMAGES SEC/MM 2 Low b value: less diffusion gradient but higher SNR Signal loss in highly mobile water molecules (e.g. vessels): black blood images b>50 to minimize capillary perfusion b50
12 High b value IMAGES Higher b values-more diffusion component but when too high have lower signal to noise Highly cellular tissues such as tumors-water is restricted Additional b values for research or more accurate ADC b1000
13 Log (Relative SI) ADC MAP b50 b500 Slope of line represents ADC: relative signal intensity on y axis and b value on x axis b1000 ADC = log(s 0 / S 1 ) / (b 1 - b 0 ) b-values (s/mm 2 )
14 DIFFUSION MR Theory: malignant lesions have restricted diffusion and are bright while benign lesions do not although in practice not always true Diffusion MR only adds few minutes in total
15
16 T1 FS POST GAD T2
17 T1 FS POST GAD Better than T2 b500 Diffusion
18 T1 FS POST GAD Restricted ADC
19 PHYSIOLOGIC RESTRICTED DIFFUSION Impeded water diffusion from high cellularity Spleen Adrenal Lymph nodes Kidneys Testes Penis Hematopoietic bone marrow
20 DWI OF KIDNEY, ADRENAL AND SPLEEN Ciliated hepatic foregut cyst LA S LA S LA S LK LK LK B50 B500 B800 LA = left adrenal LK = left kidney S = spleen ADC
21 IMPROVED CONSPICUITY: UNKNOWN PRIMARY HASTE T2 T1 post B500 ADC
22 QUALITATIVE AND QUANTITATIVE EVALUATION OF DWI Qualitative-observe visually based on DWI and ADC map use routinely more than quantitatively High signal on high b value images (dark ADC map) suggest restricted diffusion generally from greater cellularity and integrity of cell membranes Tumor with necrosis, hypocellular or cystic tumors restrict less
23 DIFFUSION MRI-LIVER We use DWI routinely in all liver MR cases Helpful in detection of hepatic lesions similar to bone scan or PET scan detect additional lesions directs to re-review the conventional imaging to identify lesions Helpful but has limitations in characterization of hepatic lesions can confirm true lesion and not pseudolesion
24 CARCINOID METASTASES AND LIVER CYST ARTERIAL PHASE VENOUS PHASE
25 CARCINOID METASTASES AND LIVER CYST Metastases bright on DWI (and dark on ADC) from restricted diffusion and cyst is darker (bright on ADC) b500 ADC mets cyst cyst
26 METASTATIC MELANOMA WITH PRIOR THERAPY T1 FS CE T1 FS CE T1 FS CE T1 FS
27 METASTATIC MELANOMA WITH PRIOR THERAPY DWI b500 DWI b500 DWI b500 CE T1 FS
28 LESION CHARACTERIZATION Especially helpful for cysts and hemangiomas which may have free water Limitations in distinguishing solid benign lesions (FNH and adenomas) from malignant lesions (HCC and mets) Restricted diffusion not only seen in tumors but also abscesses restricted diffusion distinguish from simple cysts
29 T2 SHINE THROUGH EFFECT Pitfall-signal intensity on DWI depends on both water diffusion and T2 relaxation time Lesions with long T2 relaxation times (cysts, hemangiomas) may remain high signal on DWI and be mistaken for restricted diffusion Referred to as T2 shine-through
30 T2 SHINE THROUGH EFFECT IN CYST To avoid misinterpretation, should look at the high b value images and ADC map Lesions that are high signal on high b value images and ADC are from T2 shine through effect b0 b500 ADC = 4.4
31 WHY NOT JUST LOOK AT THE ADC IMAGES? Poor signal to noise ratio Use DWI to detect Use ADC map image to differentiate restricted diffusion from T2 shine through ADC
32 WHY NOT JUST LOOK AT THE ADC IMAGES? Poor signal to noise ratio Use DWI to detect Use ADC map image to differentiate restricted diffusion from T2 shine through ADC DWI
33 WHY NOT JUST LOOK AT THE ADC IMAGES? Poor signal to noise ratio Use DWI to detect Use ADC map image to differentiate restricted diffusion from T2 shine through ADC DWI
34 GIST: NONSPECIFIC LIVER LESION
35 RENAL DISEASE COULD NOT RECEIVE GADOLINIUM
36 RESTRICTED DIFFUSION b500 ADC
37
38 T2
39 b500 ADC
40 T2 T1 FS Post GAD T1 FS T2 FS DWI b50 b800 ADC b500 ADC 32 YEAR OLD WITH MELANOMA AND UNSUSPECTED LIVER LESIONS
41 1 YEAR LATER: LESIONS LARGER AND NEW LESIONS WITH MORE DEFINITIVE FEATURES POST GAD b50 b500 Art Phase Venous Phase B50 New Lesion Art Phase Delayed Phase Washout
42 HEPATOCELLULAR CARCINOMA POST GAD T1 FS T2 b500 ADC ADC = 1.6
43 RESTRICTED DIFFUSION LOW ADC = 1.26 b500 ADC MALIGNANT? FNH
44 FNH: NEED ANATOMIC IMAGES IN ADDITION TO DWI T1 FS ARTERIAL PHASE POST GAD T2 DELAYED POST GAD
45 ABSCESSES Not only tumors have restricted diffusion and low ADC Abscesses can have restricted diffusion DWI help distinguish abscesses from cysts b400 ADC
46 LIVER CYST VS. LIVER ABSCESS T2 T1 post contrast T2 T1 post contrast
47 LIVER CYST VS. LIVER ABSCESS T2 T1 post contrast b1000 T2 T1 post contrast b1000 ADC
48 ADC (x10-3 mm 2 /s) ADC OF LIVER LESIONS BOX AND WHISKERS PLOT Metastasis HCC FNH Adenoma Abscess Hemangioma Cyst Miller FH, Hammond N, Siddiqi AJ et al. J Magn Reson Imaging Jul;32:138-47
49 LACK OF SPECIFICITY Hemangioma Metastases HCC Adenoma
50 INTERPRETATION OF IMAGES AFTER IR TREATMENT Among the most difficult in radiology No one fights to read these cases Paradoxical increase in size is seen with ablative therapies such as RF ablation, TACE and Y90 radioembolization-result of hemorrhage and necrosis No uniform standard of interpretation Ring enhancement mistaken for tumor and may be post treatment changes including scar tissue or reactive edema
51 DIFFUSION MR Lesions often don t change in size or may grow following effective changes Diffusion MR can play role in diagnosing response Following therapy, tumors with restricted diffusion (dark on ADC maps) become less restricted diffusion (bright on ADC maps) increase in ADC values Some of changes in ADC may precede changes in size of lesion
52 LIMITATIONS OF ANATOMIC ASSESSMENT Anatomic response lags behind functional changes Difficult to prospectively predict tumor response Pre Tx months Salem et al JVIR Dec 2005
53 FUNCTIONAL IMAGING: DIFFUSION Anatomic T1 post-gadolinium Functional Percentage enhancement on arterial and portal venous phases Extracellular space Tumor vascularity Detects altered water mobility Cellularity Integrity of the cell membrane Diffusion-weighted (DWI)
54 DIFFUSION: OVERSIMPLIFICATION Bright on diffusion images (dark ADC)-restricted diffusion-live tumor Dark on diffusion images-favorable response Successful treatment-dark on DWI and shows increase in ADC
55 HCC PRETREATMENT Bright
56 HCC POST TREATMENT Dark Post contrast Post Treatment DWI Post Treatment Post Treatment DWI Pretreatment
57 Pre-Treatment Arterial Phase Venous Phase DWI b50 Post-Treatment Arterial Phase Venous Phase DWI b50
58 T1 in Phase T2 Post GAD T1 FS
59 DWI PET
60 PANCREATIC IMAGING DWI may help in detecting solid pancreatic neoplasms with restricted diffusion May not be able to distinguish chronic pancreatitis from cancer because of overlap i.e. poorly differentiated adenoca and mass-forming pancreatitis have low ADC from dense fibrosis
61 PANCREATIC CANCER Critical to detect early Desmoplastic reaction accounts for low SI on T1FS images, hypoenhancement and restricted diffusion DWI especially helpful in detection and characterization of liver and lymph node and peritoneal mets
62 DIFFUSION EXAMPLE PANC CA T2 MR T1 FS MR CE T1 FS MR
63 DIFFUSION EXAMPLE PANC CA DIFFUSION B500 ADC
64 DIFFUSION EXAMPLE: ENDOCRINE TUMOR BEST SEEN ON DW NCCT Early Post Contrast Venous Post Contrast
65 ENDOCRINE TUMOR: DWI b0 b500 T1 FS CE CT
66 INSULINOMA
67 b0 b1000 ADC
68 BACKGROUND Pancreatic adenocarcinoma and mass-forming focal pancreatitis can have similar imaging findings on anatomic MRI Would be helpful for DWI to distinguish Contradictory results have been seen using DWI in the literature and wanted to determine why ADC values of pancreatic adenocarcinoma have been shown to be both higher and lower than mass-forming focal pancreatitis Fattahi et al. J Magn Reson Imaging 2009;29:350-6 Lee et al J Magn Reson Imaging 2008;28:928-36
69 MAY NOT BE ABLE TO DISTINGUISH Mass-forming pancreatitis b500 (ADC = 1.27) Adenocarcinoma b500 (ADC = 1.55)
70 EXTRACELLULAR FIBROSIS Mass-forming pancreatitis b500 (ADC=1.27) Poorly differentiated adenocarcinoma b500 (ADC =1.55) Extra-cellular fibrosis in both pancreatitis and adenocarcinoma No significant difference in ADC Wang Y, Miller FH, Chen Zongming E et al. Radiographics. 2011
71 ADC (x10-3 mm 2 /s) RESULTS: ADCs OF LESION AFTER SUBDIVISION Neuroendocrine Carcinoma (malignant) P= Well-differentiated Neuroendocrine Tumor (nonmalignant) Mass-forming focal Pancreatitis Poorly differentiated Adenocarcinoma Well/Moderately differentiated Adenocarcinoma
72 MALIGNANT ENDOCRINE: LOWER ADC VALUES Malignant endocrine carcinoma ADC=0.87 Well-differentiated endocrine tumor ADC= 2.22 High density of cellularity Cells with scant cytoplasm Lower ADC values
73 OVERLAP ONLY IN SMALL WELL DIFFERENTIATED WITH FIBROSIS Malignant endocrine carcinoma ADC=1.17 Well-differentiated endocrine tumor ADC= 1.02 High density of cellularity High density of fibrosis Low ADC values
74 ADC (x10-3 mm 2 /s) RESULTS: ADCs OF LESION AFTER SUBDIVISION Neuroendocrine Carcinoma (malignant) Well-differentiated Neuroendocrine Tumor (nonmalignant) Mass-forming focal Pancreatitis P= Poorly differentiated Adenocarcinoma Well/Moderately differentiated Adenocarcinoma
75 POOR DIFFERENTIATED TUMORS WITH MORE FIBROSIS: LOWER ADC Poorly differentiated adenoca ADC=1.48 Moderately differentiated adenoca ADC=2.27 Extra-cellular fibrosis Limited glandular formation Lower ADC values Wang Y, Miller FH, Chen Zongming E et al. Radiographics. 2011
76 DWI DWI did not distinguish mass-forming pancreatitis and adenocarcinoma fibrosis in both Grades of differentiation of tumors may be distinguished because of differences in cellularity, glandular differentiation and extracellular fibrosis
77
78 b500 ADC
79 RENAL IMAGING Especially helpful when concern of NSF and cannot give gadolinium Helps detect and confirm solid mass-suspect RCC Other lesions can have restricted diffusion-abscesses, angiomyolipomas, oncocytomas DWI images help guide to the anatomic abnormality which may be subtle
80 UNSUSPECTED SMALL RCC b800 ADC
81
82 NCCT Axial CECT Coronal CECT Axial Postgad Coronal Postgad b500 ADC
83 PCKD IN HORSESHOE KIDNEY WITH FEVERS; COULDN T GIVE GAD AS CONCERN OF NSF-LOW GFR Coronal T2 Coronal T2
84 Axial T2 b800
85 ADC Map CT Guided Biopsy
86 51 YR OLD MYELODYSPLASTIC SYNDROME AND FEVERS T1 FS T2
87 Post GAD T1 FS T2 Post GAD Sag T1 FS
88 RESTRICTED DIFFUSION: DARK ADC b800 ADC
89 DWI BETTER THAN T2
90 PYONEPHROSIS 64 year old male with rectal cancer: Worsening renal function Could not give GAD UNENHANCED CT T2WI DWI b500 ADC
91 ADRENAL GLAND Most important lesions to distinguish are not cystic from solid lesions but adrenal adenomas from metastases or adrenal cell carcinoma DWI is nonspecific; need very high specificity in the diagnosis of adenomas While malignant adrenal masses show restricted diffusion, adrenal adenomas also may show restricted diffusion
92 CARCINOMA: ADC 0.99 B500 B0 ADC Mean of carcinomas was 1.47 without difference from other lesions except cysts being higher.
93 ADENOMA: ADC 0.64 / SI DECREASE 46% IN PHASE OUT PHASE b500 b0
94 ADC (x10-3 mm 2 /s) ADCS OF ADRENAL LESIONS Myelolipoma Hemorrhage Adenoma Cyst Carcinoma Pheochromocytoma Metastasis Miller FH, Wang Y, McCarthy RJ, et al. Am. J. Roentgenol 2010; 194: W179-W185
95 Signal intensity (% Decrease), AUC = 0.93 Lesion size (cm), AUC = 0.82 ADC (x10-3 mm2/sec), AUC = Specificity Miller FH, Wang Y, McCarthy RJ, et al. Am. J. Roentgenol 2010; 194: W179-W185
96 LYMPH NODE AND PERITONEAL IMPLANTS One of best uses for DWI-lymph node metastases and small peritoneal implants Conventional MR is not always ideal for showing lymph nodes and peritoneal implants-distinguishing from bowel can be difficult DWI helps direct radiologist to pathology on conventional imaging
97 LYMPH NODE AND PERITONEAL IMPLANTS In my opinion, DWI often does not distinguish benign from malignant lymph nodes but great sequence to show nodes Increasing use of MR because of radiation concerns when doing multiple CT scans for followup imaging especially when young patients (testicular cancer and lymphoma) where lymph nodes and DWI are important
98 TESTICULAR CANCER RECURRENCE: LYMPH NODES T2 T1 FS Diffusion b1000 b1000
99 TESTICULAR CANCER WITH RECURRENCE BEST SEEN ON B800 b50 b500
100 FALLOPIAN TUBE CANCER T1 FS T2 DWI b1000
101 FALLOPIAN TUBE CANCER T1 FS DWI b1000
102 VULVAR CANCER: DWI CRITICAL FOR METS Sag Post GAD T1 FS Axial Post GAD T1 FS
103 VULVAR CANCER: DWI CRITICAL FOR METS Axial Post GAD T1 FS DWI b500 Sag Post GAD T1 FS
104 VULVAR CANCER: DWI CRITICAL FOR METS Axial Post GAD T1 FS DWI b500
105 APPENDICITIS IN PREGNANT PT T2 True FISP T1 FS
106 APPENDICITIS IN PREGNANT PT T2 True FISP T1 FS b800 ADC
107 TUBO-OVARIAN ABSCESSES (TOA) T2 T1FS POSTGAD T1FS
108 TUBO-OVARIAN ABSCESSES (TOA) T2 T1FS POSTGAD T1FS DWI b800 ADC
109 28 YEAR OLD PELVIC PAIN AND FEVER T2 T1 FS Post GAD T1 FS T1 FS Post GAD
110 DWI-TUBOOVARIAN ABSCESS (TOA) DWI b800 ADC
111 INTER-LOOP ABSCESS: 73 YEAR OLD W RECTAL CANCER PRIOR RT AND FEVER AND PAIN T2 T1 post gad DWI b800 ADC
112 MR TO EVALUATE LIVER LESIONS
113
114
115
116 60 YEAR OLD WOMAN: FOLLOW UP COMPLEX RENAL CYST JULY 2014 T1 Post Gad CECT b500 ADC
117 AUG 2013 T1 Post Gad b800 Fungating, ulcerated partially obstructing adenocarcinoma in the distal transverse colon
118 MR FOR FIBROID EVALUATION PRE UFE Sagittal T2 Axial T2
119 DIFFUSION-WEIGHTED IMAGES b500
120 UNSUSPECTED RECTAL CANCER Sagittal T2 Axial T2
121 UNSUSPECTED RECTAL CANCER Sagittal Post Contrast Axial Post Contrast
122 T2 Post GAD T1 FS
123 BOTH ARE BRIGHT ON B50 IMAGE b50
124 B800 INFECTED BARTHOLIN GLAND CYST ADC
125 CONCLUSIONS DWI should be added to routine protocols Helpful in detection of lesions in liver, kidney, pancreas, lymph nodes and peritoneal implants Can be helpful in characterization Solid from cystic masses Abscesses from simple cysts Assess therapy response prior to size changes
126 ACKNOWLEDGEMENTS Dr. Shawn Haji-Momenian Dr. Laura Kulik Dr. Andrew Larson Dr. Robert J Lewandowski Dr. Reed Omary Dr. Tom Rhee Dr. Riad Salem Dr. Yi Wang
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