Chapter2 - Course: BIM 241, University of California Davis,...

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Unformatted text preview: Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 MRI System Instrumentation ► Magnet Superconductive Permanent Permanent Resistive Resistive ► Shim system field gradient subsystem Superconductive Superconductive Resistive Resistive ► Magnetic x, y, z x, MRI System Instrumentation ► RF subsystem Transmitter Receiver Receiver RF RF coils for excitation and reception ► Host computers Scan Scan parameter interface Pulse Pulse sequence controller Array Array processor, disk storage ► Operating console console Software Software for pulse sequence specification Scan Scan parameter selection Image Image display Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 1 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 GE 1.5T NV/i MRI system Siemens 3T Trio MRI system Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 2 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 3 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 4 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 5 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Shim coils Shim power supply Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 6 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 7 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 8 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 9 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 10 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Y X Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 11 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 12 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 RF coil configurations ► Single transmit-receive coil transmitBody coil Bod Head coil Head Knee coil Knee ► Body transmit, separate receive coil Surface Surface coil receive ReceiveReceive-only cardiac coil ReceiveReceive-only abdominal coil ► Signal reception mode reception mode Linear Linear reception Quadrature Quadrature reception Array Array (with or without parallel imaging capability) Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 13 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 14 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 15 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 16 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 17 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 18 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 19 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 20 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 21 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 22 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Safety and Risk Management ► Static main magnetic field ► Time-varying magnetic fields (gradients) ime► Radiofrequency power (RF subsystem) Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 23 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Federal limits on MR fields ► Static magnetic field magnetic fields power Tesla maximum ► Time-varying Time- Tesla/sec Tesla/sec maximum ► Radiofrequency Whole bod W/kg ma Whole body W/kg maximum Short Short time W/kg maximum Missile Effect ► Large and small objects, if ferromagnetic (even if a small fraction of the object if th material material is ferromagnetic), are significant hazards in the magnet room. ► The spatial gradient of the main magnetic field creates force on the object toward field creates a force on the object toward the the center of the main magnetic field (where the patient being scanned is). Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 24 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Absolute contraindications ► Cardiac pacemaker ► Cerebral aneurysm clip ► Shrapnel or metallic foreign body in orbit ► Implanted active electromechanical devices Relative Relative contraindications ► Middle ear prosthesis ► Surgically implanted prosthesis ► Most objects have been tested for safety and appear in “The List” by Frank Shellock, PhD, Website www.mrisafety.com ► Claustrophobia Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 25 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Patient emergencies ► The static magnetic field adversely affects nearly all medical life-saving devices. life► Because of these effects, patients needing lifelife-saving intervention must be removed from the magnet room before intervention is attempted. is attempted. Patient injury ► If a patient is injured by and or is at risk from ferromagnetic object that has been from a ferromagnetic object that has been attracted attracted into the main field, it may be necessary to perform a “controlled rundown” of the main magnetic field to zero. The patient can then be safely moved and treated and treated. ► “Controlled rundown” requires only a few seconds, it is much different than a quench. Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 26 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 Safety message Static Magnetic field is ON and at full strength at all times!!! th ti Risk Management ► Security ► Education ► Screening ► Vigilance Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 27 Course: BIM 241, University of California Davis, Instructor: Michael H. Buonocore 11/2/2008 END Do not distribute this document. Use of this document is restricted to persons enrolled in the BIM 241 course, UC Davis. 28 ...
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This note was uploaded on 10/15/2010 for the course BIM BIM251 taught by Professor Buonocore during the Spring '09 term at UC Davis.

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