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MRI REGISTRY
| Question | Answer |
|---|---|
| Nerve IV | Glossopharyngeal |
| Nerve X | Vagus |
| Nerve XI | spinal accessory |
| Nerve XII | hypoglossal |
| Nerve VIII | vestibulocochlear |
| Nerve VII | facial |
| Nerve VI | Abducens |
| Nerve V | Trigeminal |
| Nerve IV | Trochlear |
| Nerve III | oculomotor |
| Nerve II | Optic |
| Nerve I | Olfactory |
| QC test for low contrast spatial resolution | Circular image. Should be able to visualize 10 spokes |
| QC test for geometric accuracy ( Z) | Rectangular image showing triangles and rectangles |
| QC test for geometric accuracy (XY) | Circular image with the graph in the center |
| The sagittal dural sinuses drain into the | Internal jugular vein |
| A small FOV for a wrist exam would achieve | High spatial resolution |
| Bright signal in the prostate would indicate | Restricted diffusion |
| The prostate is posterior and inferior to the | Bladder |
| Hemosiderin Appears_______on T2 images | Hypointense |
| The two best planes for TOF of the subclavian artery‘s are | Axial and sagittal |
| Gradient echo fast breath hold dynamic contrast enhanced imaging of the abdomen utilize | Spoiling |
| Steady state imaging is | When there is leftover transverse magnetization (what occurs if the TR is less than T2/T2*) |
| _______ contrast is dependent on impairment of molecular mobility, sensitivity to Brownian motion, and direction of water diffusion | DWI |
| To compensate for FID | Increase NEX enable flow compensation |
| Tissues with a long T2 Time are bright on | T2 images |
| FDA approved oral contrast agent makes the bowel appear | T1 and T2 hypointense |
| DWI susceptibility in or around strong air tissue interfaces can be decreased by | Increasing the parallel imaging factor |
| ______Is caused by interface of aliased signals at different phases | Moire |
| Parallel imaging artifacts can be compensated for by | Decreasing the parallel imaging factor Increasing FOV |
| Acquiring half of the data in the frequency direction | Partial or fractional echo |
| Using gradient moment nulling | Increases the minimum TE |
| Tissues with short T1 times are bright on | T1 images |
| _______Has a long T1 time and a short T2 time | Fat |
| ______Has a long T1 time and a long T2 time | Water |
| High amplitude signal is found in The | Center of K space |
| Increasing the echo train length | Increases chances of blur |
| Increasing the number of excitations by 2 | Increases SNR by the square root of two |
| Acquiring half of data in the phase direction | Half forurier or zero fill |
| Active shielding | Superconducting windings in the MRI scanner ( reduce fringe Field) |
| Gradient slew rate | The rate of ascent or descent from zero to maximum |
| Echo planer imaging sequences | Are more at risk for TVMF effects |
| Transmit gain | Evaluate accuracy of flip angles |
| On a 1 T, the frequency difference between fat and water is | 147 HZ |
| The common iliac’s join to form the | Inferior vena cava |
| Pre-saturation bands for TOFMRA of the inferior vena cava would be placed | Superior |
| The vertebral arteries originate from the | Subclavian artery’s |
| Bloch | Discovered magnetic momentum |
| The first image of the human thorax was in the year | 1977 (By the Damadian and team) |
| Discovered to DNMR, Fourier transform, and phase and frequency gradients | Ernst |
| fMRI was available in the year | 1991 |
| The Fourier equation | Is for heat transfer |
| Discovered how fields are Altered by each other with charges or currents | Maxwell |
| Developed the first rotating magnetic field | Tesla |
| #Of slices X slice thickness X slice gap = | Anatomic coverage equation |
| Pixel size equation for phase and frequency matrix multiplied = | Pixel area (answer in MM squared) |
| FOV/phase & FOV/frequency = | Pixel size (answer in A x B format) |
| When imaging a patient with metal hardware | Use thin slices, add NEX, small pixels for large matrix, no parallel imaging, wide rBW (decreases chemical shift), use STIR vs fat sat, use fast spin echo over gradient echo |
| Coil location in magnet from closest to patient to furthest from patient | Radio frequency coils, gradient coils, shim coils, main magnet |
| Doubling the magnetic field strength | Doubles the SNR |
| Pneumonic for cranial nerves | Oh, oh, oh to take a family vacation. Go Vegas south hardees |
| Administering gadolinium | Increases T1 weighting Increases SNR |
| Tissues with a_____are bright on T1 and tissues with a______are bright on T2 | Short; long |
| Gadolinium only affects______protons | Water |
| 60,000 / HR minus delay and trigger window | Available imaging time |
| 60,000/HR | Effective TR |
| TR x Phase matrix x NEX x #of slices = | 3-D gradient echo scan time |
| TR x phase matrix x NEX / ETL = | Fast spin echo scan time |
| TR x phase matrix x NEX = | Spin echo scan time |
| Calculate pixel area and x by slice thickness | Voxel volume (answer in MM cubed) |
| Increasing the TE | Decreases SNR increases T2 weighting Increases susceptibility/distortion |
| Large FOV | Decreases spatial resolution, increases SNR, no affect on scan time |
| Small FOV | Decreases SNR, increases spatial resolution, no effect on skin time |
| High NEX value | Increases spatial resolution, increases scan time, increases SNR |
| Low NEX value | Decreases spatial resolution decreases scan time decreases SNR, increases motion artifact |
| Increasing flip angle | Increases T1 weighting |
| Decreasing phase encodings | Decreases scan time, decreases spatial resolution, increases SNR |
| Artifacts that occur in the frequency direction | Chemical shift, zipper |
| Artifacts that occur in the phase direction | Motion, ghosting, zipper, parallel imaging, alaising |
| Artifacts in the slice selection direction | Chemical shift, partial voluming |
| Increasing parallel imaging factor | Decreases scam time, decreases chemical shift artifact, increases sharpness, decreases SNR |
| Decreasing receiver bandwidth by 2 | Increases SNR by the square root of two |
| #Of shots and fast spin echo | # phase and coatings/ETL |
| Level two personnel | Those with extensive MR training |
| Level one personnel | Those with limited in MR training |
| Best plane for the ovaries is____and to the best plane for the uterus is_____ | Coronel; sagittal |
| Edema is bright on T2 images because it has a | Long T2 time |
| Edema is dark on T1 images because it has | Long T1 time |
| Removal of signal from vessels | Spatial pre-saturation |
| Can increase the strength of the magnet by increasing the turns of wire in a | Superconducting magnet |
| Uses solenoid Surface coils | Permanent magnet with a vertical field |
| Narrow bandwidth | Increases SNR, increases spatial resolution, increases scan time, increases chemical shift |
| Wide bandwidth | Decreases SNR, decreases special resolution, decreases scan time, decreases chemical shift, decreases TE, increases sharpness |
| Transmit bandwidth can affect | Slice thickness, spatial resolution, SNR |
| Receiver bandwidth can affect | SNR and chemical shift |
| Collecting low frequency/ high amplitude signal at the start of the scan | Elliptic centric K space filling |
| During dynamic contrast enhanced imaging for vasculature, Cay spaces filled_______to ensure well visualized contrast | Centrically |
| TOF MRA | Uses T1 gradient echoes with TR and flip angle selections to suppress signal from stationary tissue, visualizing flowing blood by flow enhancement |
| PC MRA | Uses T2 gradient echo with perimeter selections that suppress stationary tissues and rely on velocity induced phase shift |
| Increasing the flip angle by 2 | Increases RF absorption by four |
| Decreasing the field of view by two | Decreases voxel volume by four |
| Thin slices | Decrease SNR, increase spatial resolution |
| Thick slices | Increase SNR, decreased spatial resolution |
| Thin sliced gaps | Increase spatial resolution and SNR |
| Thick sliced gaps | Decrease special resolution and SNR |
| Decreasing the number of slices in volume imaging | Decreases SNR and decrease scan time |
| Small matrix | Decreased spatial resolution, increase SNR, decreased scan time |
| Large matrix | Increase spatial resolution, decrease SNR, increase scan time |
| Hi TR values | Increase Scan time, increase special resolution, increased number of slices, increase SNR, decrease T1 weighting |
| Low TR values | Decrease scan time, decrease spatial resolution, Decrease SNR, decrease the number of slices, increase T1 weighting |
| Active shimming | Adjustment of current within the shim coils for the purpose of achieving uniform fat suppression |
| Transverse magnetization | XY component at right angles to the main magnetic field |
| Net magnetization vector | Sum of the magnetization from a spin system |
Created by:
hsiegrisr
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