TRADITIONAL POSTER - ismrm

Poster Sessions
2825. Focused Primary Tumour Staging and WB-MRI Distant Disease Assessment: A Potential All-In-One
Staging Tool
Martin D. Pickles 1 , Lindsay W. Turnbull 1
1 Centre for MR Investigations, University of Hull, Hull, East Yorkshire, United Kingdom
Oncology patients undergo multiple imaging investigations to stage their disease. The aim of this study was to investigate the feasibility of a focused primary
tumour (breast or prostate) examination in combination with a WB-MRI for staging of distant disease. If successful we propose the addition of this technique
could allow the omission of other examinations, such as radionuclide imaging, thereby streamlining the current imaging pathway. We conclude that focused
primary tumour examinations in combination with a WB-MRI for staging of distant disease is feasible. However, the technique needs to validated in a much
larger cohort than the one studied.
2826. Imaging Characteristics of Metastasis in Whole Body Diffusion Weighted Imaging of Renal Clear Cell
Carcinoma
Jing Liu 1 , XiaoYing Wang 1 , XueXiang Jiang 1
1 Department of Radiology, Peking University First Hospital, BeiJing, China
The study aimed to explore the role of Whole-body DWI in clear cell renal cell carcinoma (RCC) and obtain the imaging characteristics of metastases. Ten
patients with histologically confimed clear cell RCC and possible metastatic lesions were underwent standard Whole-body DWI, chest CT and routine MR
examinations before chemotherapy. The results showed that the whole body DWI was very sensitive to the metastatic lesions in clear cell RCC and DWI
showed its high rate of detection in pulmonary metastases. Whole body DWI had revealed great potential in metastatic screening of clear cell RCC.
2827. Whole Body Imaging Multiparametric (T2/DWI/DCE) and Advanced Multimodality (PET/CT) for
Detection of Recurrent Metastatic Cancer
Michael A. Jacobs 1 , Li Pan 2 , Katarzyna J. Macura 1 , Thorsten Feiweier 3 , Wilhelm Horger 3 , Christine
Lorenz 2 , Richard L. Wahl 1
1 The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine,
Baltimore, MD, United States; 2 Center for Applied Medical Imaging, Siemens Corporation, Corporate Research, Baltimore,, MD,
United States; 3 Siemens AG, Healthcare Sector, Magnetic Resonance, Germany
By using Whole Body MR and PET/CT approach to investigate metastatic disease can lead a better understanding of cancer aggressiveness. Functional
imaging such as DWI/ADC, DCE-MR and 11C Choline PET is feasible and thus, combined DWI/ADC mapping, and PET/CT provides radiological
biomarkers of molecular environment and could provide targets imaging treatment response.
B1 +/- Mapping
Hall B Monday 14:00-16:00
2828. B1 Mapping of an 8-Channel TX-Array Over a Human-Head-Like Volume in Less Than 2 Minutes:
The XEP Sequence
Alexis Amadon 1 , Nicolas Boulant 1 , Martijn Anton Cloos 1 , Eric Giacomini 1 , Christopher John Wiggins 1 ,
Michel Luong 2 , Guillaume Ferrand 2 , Hans-Peter Fautz 3
1 Neurospin, CEA/DSV/I2BM, Gif-sur-Yvette, France; 2 IRFU, CEA/DSM, Gif-sur-Yvette, France; 3 Siemens Healthcare, Erlangen,
Germany
Efficient mitigation of the RF inhomogeneity using transmit coil arrays relies on the knowledge of the individual B1-maps. As the number of transmit
channels increases, so does the acquisition time of all maps. Here we focus on a fast 2D sequence proposed by Fautz et al. which we adapt for multi-slice
B1-mapping. We compare its results with that of the 3D AFI sequence on a spherical phantom surrounded by 8 transmit elements at 7T. We show
comparable performance with a 12-fold increase in speed, making accurate B1-mapping of the human head feasible in 1.5 minutes for 8 transmit channels.
2829. B1 Mapping with Whole Brain Coverage in Less Than One Minute
Steffen Volz 1 , Ulrike Nöth 1 , Ralf Deichmann 1
1 Brain Imaging Center (BIC), Goethe University Frankfurt, Frankfurt am Main, Germany
There is great demand for fast B1 mapping techniques, e.g. for correction of quantitative T1 maps. However, most methods suffer from long experiment
durations. The technique presented here is based on magnetization prepared FLASH imaging with specially designed preparation and excitation pulses to
allow for multislice imaging, speeding up the acquisition. Systematic errors due to relaxation effects are avoided by intensity correction of individual k-space
lines. The method allows for fast B1 mapping with whole brain coverage, an in-plane resolution of 4 mm, a slice thickness of 3 mm, and an accuracy of 2%
within 46 s.
2830. Fast RF Flip Angle Calibration by Bloch-Siegert Shift
Laura Sacolick 1 , Ling Sun 2 , Mika W. Vogel 1 , Ileana Hancu 3
1 GE Global Research, Garching b. Munchen, Germany; 2 GE Healthcare, Waukesha, WI, United States; 3 GE Global Research,
Niskayuna, NY, United States
Here we present a novel method for automated RF flip angle calibration based on the Bloch-Siegert shift. The Bloch-Siegert shift is an effect where spin
resonance frequency shifts when an off-resonance RF field is applied. Two off-resonance RF pulses were added to a slice-selective spin echo sequence. The
off-resonance pulses induce a phase shift in the acquired signal that is proportional to B12. The signal is spatially localized in two dimensions- by slice
selection and readout filter, and the signal weighted average B1 over the slice is calculated. This calibration from a starting system transmit gain to measured