Felipe Godinez
King's College London
Avalanche photodiodeSignalPhotomultiplierOpticsPhysicsRadiologyPET-CTBiomedical engineeringInterventional magnetic resonance imagingMaterials scienceImage resolutionPositron emission tomographyRheumatoid arthritisSynovitisScannerNuclear medicineHigh resolutionComputer scienceCurrent sensorMedicineDetector
21Publications
5H-index
98Citations
Publications 21
Newest
#1Felipe Godinez ('KCL': King's College London)H-Index: 5
Last. Shaihan J. Malik ('KCL': King's College London)H-Index: 19
view all 9 authors...
Background.Parallel transmit (pTx) has introduced many benefits to magnetic resonance imaging (MRI) with regard to decreased specific absorption rates and improved transmit field homogeneity, of particular importance in applications at higher magnetic field strengths. PTx has also been proposed as a solution to mitigating dangerous RF induced heating of elongated conductive devices such as those used in cardiac interventions. In this work we present a system that can augment a conventional scann...
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#1Felipe Godinez ('KCL': King's College London)H-Index: 5
Last. Shaihan J. Malik ('KCL': King's College London)H-Index: 19
view all 9 authors...
PURPOSE We present in vivo testing of a parallel transmit system intended for interventional MR-guided cardiac procedures. METHODS The parallel transmit system was connected in-line with a conventional 1.5 Tesla MRI system to transmit and receive on an 8-coil array. The system used a current sensor for real-time feedback to achieve real-time current control by determining coupling and null modes. Experiments were conducted on 4 Charmoise sheep weighing 33.9-45.0 kg with nitinol guidewires placed...
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Objectives To prospectively demonstrate the feasibility of performing dual-phase SPECT/CT for the assessment of the small joints of the hands of rheumatoid arthritis (RA) patients, and to evaluate the reliability of the quantitative and qualitative measures derived from the resulting images. Methods A SPECT/CT imaging protocol was developed in this pilot study to scan both hands simultaneously in RA patients, in two phases of 99mTc-MDP radiotracer uptake; namely the soft-tissue blood pool phase ...
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#1Felipe Godinez ('KCL': King's College London)H-Index: 5
Last. Shaihan J. MalikH-Index: 19
view all 8 authors...
Background: Parallel transmit (pTx) has introduced many benefits to MRI with regard to decreased specific absorption rates and improved transmit field homogeneity, of particular importance in applications at higher magnetic field strengths. PTx has also been proposed as a solution to mitigating dangerous RF induced heating of elongated conductive devices such as those used in cardiac interventions. In this work we present a system that can augment a conventional scanner with pTx, in particular f...
#1Felipe Godinez ('KCL': King's College London)H-Index: 5
#2Greig C. Scott (Stanford University)H-Index: 23
Last. Shaihan J. Malik ('KCL': King's College London)H-Index: 19
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PURPOSE: MRI-guided cardiovascular intervention using standard metal guidewires can produce focal tissue heating caused by induced radiofrequency guidewire currents. It has been shown that safe operation is made possible by using parallel transmit radiofrequency coils driven in the null current mode, which does not induce radiofrequency currents and hence allows safe tissue visualization. We propose that the maximum current modes, usually considered unsafe, be used at very low power levels to vi...
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#1Felipe GodinezH-Index: 5
#2Joseph V. HajnalH-Index: 86
Last. Shaihan J. MalikH-Index: 19
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#1Felipe Godinez ('KCL': King's College London)H-Index: 5
#2Kuang Gong (UC Davis: University of California, Davis)H-Index: 15
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
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A positron emission tomography (PET) scanner with submillimeter spatial resolution, capable of in vivo imaging of murine extremities was built based on two dual ended readout, hybrid depth of interaction (DOI) PET detectors. Each was composed of a 36 {\times } \,\, 36array of 0.43 mm {\times } \,\, 0.43mm {\times } \,\, 8mm unpolished lutetium oxyorthosilicate crystals separated by a 50~\boldsymbol \mu \text{m}white diffuse reflector. The array was coupled to a position-sensing photo...
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#1Felipe GodinezH-Index: 5
#2Joseph V. HajnalH-Index: 86
Last. Shaihan J. MalikH-Index: 19
view all 6 authors...
#1Felipe GodinezH-Index: 5
#2Joseph V. HajnalH-Index: 86
Last. Shaihan J. MalikH-Index: 19
view all 5 authors...
#1Abhijit J. Chaudhari (UC Davis: University of California, Davis)H-Index: 18
#2Andrea Ferrero (UC Davis: University of California, Davis)H-Index: 11
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
view all 10 authors...
Objective:Rheumatoid arthritis (RA) and psoriatic arthritis (PsA) commonly affect the small joints of the wrist and hand. We evaluated the performance of a new, high-resolution extremity positron emission tomography (PET)/CT scanner for characterizing and quantifying pathologies associated with the two arthritides in the wrist and hand joints.Methods:Patients with RA or PsA underwent fluorine-18 fludeoxyglucose (18F-FDG) PET/CT wrist and hand imaging, respectively, on the high-resolution scanner...
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