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| Additional information about the imaging facility, all associated contacts, and MRI hardware can be found at: * [[Infrastructure/MagneticResonanceImaging]] |
= Infrastructure = || Modality || Manufacturer || Model || || CT || Siemens || SOMATOM Definition Edge || || MRI || Siemens || || |
Contents
Prerequisites Protocols
Initial Goal
A set of magnetic resonance (MR) and computer tomography (CT) images of the extremity specimen (upper/lower leg, upper/lower arm) with clear visual delineation of skin, fat, and muscle layers.
= Infrastructure =
Modality |
Manufacturer |
Model |
|| CT || Siemens || SOMATOM Definition Edge ||
MRI |
Siemens |
|
Workflow
Schedule MRI/CT
MRI: Contact Tracy Painter (CCF), paintet@ccf.org
CT : Contact Kerry Grimberg, kerrygrimberg@case.edu
Preparation
Follow the instructions found here, they include registration marker attachment and placement in an imaging fixture
- Double bag using a sterile technique
- Bring USB to transfer MRI data
- CT data is transferred via the Cleveland Clinic servers
- Transport to MRI/CT
Position/Orientation in MRI/CT
- Anatomical position
- Anterior Up
- Distal end of extremity in first
Acquire Image Sequences
For each segment (upper leg, lower leg, upper arm, and lower arm), the following set of image collection protocols will be performed. All images should be acquired in the same coordinate system to be able to align reconstructed tissue geometries during assembly of the full segment geometry. To accomplish this
- The origin (isocenter) and the axes of the magnet, which is set at the beginning of the session, should not change.
- The specimen should not be moved. It should be noted that a pixel-by-pixel alignment of image sets (co-localization) is not necessary.
- Before, each sequence is acquired, verify that the acquisition properties match the desired settings in the tables below. After each sequence is acquired, inspect the images and compare them against the sample images below to to ensure that it was collected properly. If not, the sequence should be recollected.
Notes for CT
- Clean and use stainless push cart found in robot lab to transport specimen
- Ensure operator chooses correct anatomical position
- Use the MULTIS protocol
- Ask to have images placed on CCF server to be downloaded later
MRI Specifications
Image Acquisition Properties: Download T1 SettingsDownload PD Settings
|
T1 w/o Fat Sup |
T1 w/ Fat Sup |
Proton Density |
Plane |
Axial |
|
|
FS |
No |
Yes |
No |
Matrix (phase) |
389 |
|
|
Matrix (freq.) |
512 |
|
|
No. of slices |
25 |
|
|
No. of Seq/Segment |
4 |
|
|
FOV (mm) |
240 x 202.5 |
|
|
Slice thickness/gap (mm/mm) |
2/1 |
|
|
Flip angle (deg.) |
30 |
|
150 |
TE/TR (ms/ms) |
11/500 |
|
9.7/4000 |
Bandwidth (Hz/pixel) |
238 |
|
222 |
Chemical shift (pixels) |
N/A |
|
|
No. excitations averaged |
1 |
|
|
Turbo Factor |
3 |
|
|
Phase encode axis |
Anterior-posterior |
|
|
Distance factor (%) |
50% |
|
|
Phase oversampling |
0 |
|
|
Slice oversampling |
0 |
|
|
Phase resolution (%) |
90 |
|
|
Phase partial Fourier (8/8 = 1) |
OFF |
|
|
Readout partial Fourier (8/8 = 1) |
OFF |
|
|
Slice partial Fourier (8/8 = 1) |
7/8 |
|
|
X-resolution (mm) |
0.5 |
|
|
Y-resolution (mm) |
0.5 |
|
|
Scan Time / Seq. (min.) |
~3 min |
|
|
CT Specifications
Slice thickness/gap (mm/mm) |
0.6/0 |
Reconstruction Interval (mm) |
0.6 |
Recon Type / Kernel |
B40 - medium - Abdomen window |
Voltage |
140 kVP |