Metallic fragments in the eye are very dangerous because moving those fragments could cause eye damage or blindness. People with pacemakers cannot be scanned or even go near the scanner because the magnet can cause the pacemaker to malfunction. Aneurysm clips in the brain can be very dangerous as the magnet can move them, causing them to tear the very artery they were placed on to repair.
MRI magnetic fields are incredibly strong. A watch flying off an arm and into the MRI machine is entirely possible. Sign up for our Newsletter! Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Citation, DOI and article data. Bell, D. Gauss unit. Reference article, Radiopaedia. G unit of magnetism CGS unit of magnetic flux density Gs unit of magnetism.
URL of Article. Terminology As for all eponymous units of measurement when the unit is written out in full it is not capitalized, but when shortened to its symbol it is capitalized. History and etymology It is named after the German mathematician and physicist Karl Friedrich Gauss 2.
Jerrard HG. A Dictionary of Scientific Units. Haas LF. Karl Friedrich Gauss Most dangerous place? Static field bioeffects? Flickering lights? Metallic taste? RF safety overview? RF biological effects? What is SAR? SAR limits? Operating modes? How to reduce SAR?
RF burns? Estimate implant heating? Personnel exposure? Cell phones? Gradient safety overview Acoustic noise? Nerve stimulation? Gradient vs RF heating? Deep brain stimulators? Spinal cord stimulators? Vagal nerve stimulators? Cranial electrodes? Carotid clamps? Peripheral stimulators? Epidural catheters? Additional orbit safety? Cochlear Implants? Bone conduction implants?
Other ear implants? Breast tissue expanders? Breast biopsy markers? Respiratory stimulators? Swan-Ganz catheters? IVC filters? Implanted infusion pumps? Pacemaker dangers? Pacemaker terminology? Violating the conditions? Cardiac monitors? Heart valves? Miscellaneous CV devices?
PIllCam and capsules? Gastric pacemakers? Other GI devices? Contraceptive devices? Foley catheters? Incontinence devices? Penile Implants? Sacral nerve stimulators? GU stents and other? Orthopedic hardware? External fixators? Traction and halos? Bone stimulators? Magnetic rods? Predict nuclear spin I? Magnetic dipole moment? Energy splitting? Fall to lowest state? Quantum "reality"? Why precession? Who was Larmor? Energy for precession? Chemical shift? Net magnetization M?
Does M instantly appear? Does M also precess? Who discovered NMR? How does B1 tip M? Why at Larmor frequency? What is flip angle? Phase coherence? Release of RF energy? Rotating frame? Adiabatic excitation? Adiabatic pulses? Bloch equations? What is T1? What is T2? Relaxation rate vs time? Causes of Relaxation?
Dipole-dipole interactions? Chemical Exchange? Spin-Spin interactions? Macromolecule effects? Which H's produce signal? Magnetization Transfer? T1 bright? Free Induction Decay? Gradient echo? TR and TE? Spin echo? Stimulated echoes? STEs for imaging?
Partial flip angles? How is signal higher? Optimal flip angle? Meaning of weighting? Does SE correct for T2? What is IR? Why use IR? Phase-sensitive IR? Why not PSIR always? Choice of IR parameters? TI to null a tissue? IR-prepped sequences? Double IR? GRE vs SE? Multi-echo GRE? Types of GRE sequences?
Commercial Acronyms? Spoiling - what and how? Spoiled-GRE parameters? Spoiled for T1W only? What is SSFP? What's wrong with GRE? Making an SW image? Quantitative susceptibility? What is diffusion? Making a DW image? What is the b-value? Trace vs ADC map? T2 "shine through"? Exponential ADC? T2 "black-out"? DWI bright causes?
Diffusion Tensor? DTI tensor imaging? Whole body DWI? Readout-segmented DWI? Diffusion Kurtosis? F-W chemical shift? Best method? Dixon method? Water excitation? Signal squiggles? Real v Imaginary? Fourier Transform FT? Who invented MRI? How to locate signals? Frequency encoding? Receiver bandwidth? Narrow bandwidth? Slice-selective excitation?
SS gradient lobes? Frequency encode all? Mixing of slices? Two slices at once? Simultaneous Multi-Slice? Phase-encoding gradient?
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