PET/MR:Techniques, Indications and Applications
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1 PET/MR:Techniques, Indications and Applications Franz Wolfgang Hirsch Professor and Head of the Department of Pediatric Radiology University Hospital Leipzig / Germany Children s Hospital University Leipzig
2 Structure and Function Need of Image Fusion? Hardware Fusion Software Fusion PET/CT SPECT/CT PET/MR PET/MR for the rest of us? Medical Inovation of the Year (2000) Niche Product (2004) Innovation for Children? (2010) Baum K.G. et al :Algorithm Generated Schemes for PET/MR Image Fusion J Digit Imaging (2011)
3 PET-MR in Children? 1. Why PET/MR? 2. How does PET/MR work? 3. Why children? 4. Application 5. Own examples 6. Trouble Hirsch FW et al.: PET/MR in children. Initial clinical experience in paediatric oncology using an integrated PET/MR scanner. Pediatr Radiol Jul;43(7):
4 Why PET/MR? Single modalities can only see a part of the whole Morphology Physiology Biochemistry MR anatomy, flow, perfusion, diffusion, function PET perfusion, function Quelle: Siemens PET/MR complementary methods
5 PET/MR Concepts Tandem vs. Integration MR PET MR / PET Tandem PET / MR Integrated PET / MR + Easier to avoid interferences - No simultaneous registration - Longer examination time + Simultaneous MR and PET + Best image coregistration + Higher throughput Source: Siemens
6 Attenuation Correction T1 out-of-phase T1 in-phase Fat image Water image µ-map Attenuation correction for PET DIXON-Sequence! Eiber, M. et al., Value of a Dixon-based MR/PET attenuation correction sequence for the localization and evaluation of PET-positive lesions Eur J Nucl Med Mol Imaging 38 (9), 2011
7 Problem with Attenuation Correction T1 out-of-phase T1 in-phase Fat image Water image µ-map Small pulmonary nodules are not well recognized in Dixon sequence Schäfer JF et al: Simultaneous whole-body PET/MR imaging in comparison to PET/CT in pediatric oncology: initial results. Radiology 2014
8 Problem with Attenuation Correction Small pulmonary nodules are PET negative 7 years old girl with rhabdomyosarcoma
9 Significantly lower radiation exposure (compared with PET-CT) Why Children? Chawla SC et al: Estimated cumulative radiation dose from PET/CT in children with malignancies: a 5-year retrospective review. Pediatr Radiol May PET/CT : 24.8 msv Radiation exposure PET: 4.6 msv (3 msv)
10 Demands Application 1. No diagnostic loss compared to conventional MR studies 2. Acceptable time (45min) 3. Not only additive benefit but symbiotic value" of the two modalities Practical realization Limitation of number and duration of the sequences Field strength of 3.0 T is used for time reduction
11 MR Sequences optional DIXON PET (AC) PET PET PET PET PET MDS = Move during scan technicque Dixon (AC) TIRM cor TIRM cor respiratorytriggered TIRM cor respiratorytriggered TIRM cor TIRM cor TIRM cor TIRM tra TIRM tra respiratorytriggered TIRM tra respiratorytriggered TIRM tra TIRM tra TIRM tra DWI tra DWI tra DWI tra DWI tra DWI tra DWI tra FLAIR, T2 T1KM respiratory-triggered T2-TSE tra, cor T2 TSE FS tra VIBE dynamic CE T1FLASH 2D FS tra CE T1FLASH 2D FS tra CE T1 SE FS CE T1 SE FS CE PET TIRM + PET 18 FDG-PET TIRM cor TIRM tra DWI tra T1 SE FS CE
12 Radionuclides and Tracers
13 90% 18 FDG PET Radionuclides 5 % 11 and C Methionin Tracers PET Visualization of glucose transport and glucose uptake Visualization of protein synthesis / diagnostic of low grade glioma Fluorin Desoxy glucose 2% 68 Ga DOTATOC Somatostatin receptor imaging: Neuroendocrine tumors, meningioma
14 90% 18 FDG PET Visualization of glucose transport and glucose uptake 5 % 11 C Methionin PET Visualization of protein synthesis / diagnostic of low grade glioma 2% 68 Ga DOTATOC Somatostatin receptor imaging: Neuroendocrine tumors, meningioma
15 90% 18 FDG PET Visualization of glucose transport and glucose uptake 5 % 11 C Methionin PET Visualization of protein synthesis / diagnostic of low grade glioma Fluorin Desoxy Glucose 3% 18 F-DOPA PET higher sensitivity than 123I-MIBG Scintigraphy in neuroblastoma 2% 68 Ga DOTATOC Somatostatin receptor imaging: Neuroendocrine tumors, meningioma Dihydroxyphenylalanine
16 PET/MR Indications 1. Oncological diseases with disseminated tumor spread staging 2. Treatment response restaging 3. Therapy planning biopsy - surgery Testicular tumor with retroperitoneal metastases Supraclavicular lymph nodes and a liver metastasis 14 years MR PET/MR PET
17 Staging: Burkitt lymphoma cervical, 2.5 year old boy The MR finding of the left-sided lymph nodes is not pathological (lymph node size left <1.5 cm) In PET +++ Lymph nodes involvement on both sides In 10% of our patients with lymphomas it comes to an upstaging after PET-MR.
18 Restaging : Acute myloid leucemia, extranodal involvement Residual tumor or scar? 15 year old girl 06 th May 07 th June 08 th August No complete remission: surgery
19 Staging: Mixed neuroblastoma / ganglioblastoma - 1 year old boy - Originated from sympathetic trunk - Inhomogeneous FDG uptake: highly differentiated tumor tissue
20 Fluoro dihydroxy phenyl alanine 18 F-FDOPA PET in neurobalstoma demonstrated a higher sensitivity than 123I-MIBG scintigraphy Meng-Yao Lu* J Characterization of Neuroblastic Tumors Using 18F-FDOPA PET Nucl Med 2013; 54:42 49
21 18 F-FDOPA PET in neurobalstoma demonstrated a higher sensitivity than 123I-MIBG scintigraphy Meng-Yao Lu* J Characterization of Neuroblastic Tumors Using 18F-FDOPA PET Nucl Med 2013; 54:42 49
22 Examples Head and Brain
23 Patient Zimmermann, Rudi, geb Refractory epilepsy without MR lesion 18 FDG-PET 6 year old girl Usfull only in patients with missing MR lesions 18 FDG-PET Interictal hypoperfusion / hypometabolism around of focus
24 65 Ga DOTATOC-PET meningioma of the optic nerve Retroorbital mass 7 year old boy 65 Ga DOTATOC-PET 65 Ga DOTATOC-PET
25 11 C-methionine-PET in multifocal brain tumor: Hot spot biopsy 11 C-methionine-PET 11 C-methionine-PET 11 C-methionine-PET
26 11 C-methionine-PET Hot spot biopsy Anaplastic astrocytoma grade III
27 Summary PET/MR in Children 1 instead of 2 studies High soft tissue contrast by MR +functional information by PET Simultaneous data acquisition Faster than sequential studies and more comfortable for patient More detailed information on nature and distribution of lesions Most accurate spatial allocation (hot spot biopsy / surgery) Important for Children Significantly lower radiation exposure than PET / CT
28 Thank you for your attention! Pet- Special thanks to MR Dr. Ina Sorge, MD, Paediatric Radiology Dr. Regine Kluge, MD PhD Nuclear medicine Dr. D. Wolf, Siemens AG Dr. H. Christiansen, MD, PhD, Paediatric oncology Berlin / Germany
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