Brain Aneurysm 3T
Siemens Healthineers – MR Gadopiclenol (VUEWAY®) Protocols
Instructions And Patient Preparation
- Instructions
- • Exam is tailored to the patient’s condition and is meant for rapid assessment at lower resolution
• May stop scan whenever adequate clinical information is obtained
• Contrast only needed if MRA or dynamic susceptibility contrast (DSC) MR perfusion also obtained - Position
- Supine, head first
- Coil
- 20 channel Head/Neck coil or better
- Landmark
- Glabella
Contrast Agent Parameters
| Contrast Agent | Dose | Injection Rate | ||||
|---|---|---|---|---|---|---|
| Gadopiclenol (VUEWAY) | 0.05 mmol/kg | CORONAL TWIST Inject 1-2 mL contrast Inject remaining contrast CE MRV Post – 2 measurements |
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| Saline Flush | 20 mL | For DSC – Power Injector 3-4 mL/sec | ||||
| Comments | • For DSC – Inject after 5-6 phases • Report agent administered and dose • Use minimal dose for patients with a GFR <60 mL/sec |
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Imaging Parameters
| Scan Description | 3D TOF MRA | Pre CE MRA |
Pre HEAD SPACE 3D VWI |
CORONAL TWIST |
Post CE MRA |
Post HEAD SPACE 3D VWI |
|---|---|---|---|---|---|---|
| View Image | View Image | View Image | View Image | View Image | View Image | |
| Sequence Name | fl_r | fl | spcR | fldyn | fl | spcR |
| Dimension | 3D | 3D | 3D | 3D | 3D | 3D |
| Acceleration Mode | CS | GRAPPA | GRAPPA | GRAPPA | GRAPPA | GRAPPA |
| Acceleration Factor PE | ― | 2 | 2 | 2 | 2 | 2 |
| Acceleration Factor 3D | ― | 2 | 1 | 2 | 2 | 1 |
| AutoAlign | Head > Brain | Head > Basis | Head > Brain | Head > Basis | Head > Basis | Head > Brain |
Scan Parameters
| Scan Description | 3D TOF MRA | Pre CE MRA |
Pre HEAD SPACE 3D VWI |
CORONAL TWIST |
Post CE MRA |
Post HEAD SPACE 3D VWI |
|---|---|---|---|---|---|---|
| TR | 21.0 ms | 3.72 ms | 700.0 ms | 2.20 ms | 3.72 ms | 700.0 ms |
| TE | 3.69 ms | 1.33 ms | 19.00 ms | 0.91 ms | 1.33 ms | 19.00 ms |
| Flip Angle | 20 deg | 25 deg | ― | 15 deg | 25 deg | ― |
| Turbo Factor | ― | ― | 38 | ― | ― | 38 |
| Bandwidth | 187 Hz/Px | 450 Hz/Px | 630 Hz/Px | 720 Hz/Px | 450 Hz/Px | 630 Hz/Px |
| Fat-Water Contrast | Standard | Standard | Standard | Standard | Standard | Standard |
| Gradient Mode | Fast | Fast | Fast | Fast | Fast | Fast |
| RF Pulse Type | Normal | Normal | Normal | Fast | Normal | Normal |
| Asymmetric Echo | Weak | Allowed | ― | Strong | Allowed | ― |
Acquisition Parameters
| Scan Description | 3D TOF MRA | Pre CE MRA |
Pre HEAD SPACE 3D VWI |
CORONAL TWIST |
Post CE MRA |
Post HEAD SPACE 3D VWI |
|---|---|---|---|---|---|---|
| Base Resolution | 352 | 288 | 256 | 256 | 288 | 256 |
| Phase Resolution | 95% | 82% | 90% | 75% | 82% | 90% |
| Slice Resolution | 67% | 70% | 90% | 75% | 70% | 90% |
| Averages | 1 | 1 | 1 | ― | 1 | 1 |
| Concatenations | 6 | ― | 1 | ― | ― | 1 |
| FoV Read | 220 mm | 240 mm | 230 mm | 300 mm | 240 mm | 230 mm |
| FoV Phase | 91% | 75% | 100% | 56% | 75% | 100% |
| Phase Encoding Dir. | R >> L | R >> L | A >> P | R >> L | R >> L | A >> P |
| Phase Oversampling | 0 | 0% | 10% | % | 0% | 10% |
| Slice Oversampling | 25% | 20% | 23% | 17% | 20% | 23% |
| Slice Partial Fourier | Off | Off | Off | Off | Off | Off |
| Flow Compensation | Slice/Read | ― | None | ― | ― | None |
Scanning Range
| Scan Description | 3D TOF MRA | Pre CE MRA |
Pre HEAD SPACE 3D VWI |
CORONAL TWIST |
Post CE MRA |
Post HEAD SPACE 3D VWI |
|---|---|---|---|---|---|---|
| Elliptical Filter | Off | Off | Off | On | Off | Off |
| Normalize | Prescan | Prescan | Prescan | Off | Prescan | Prescan |
| Distortion Correction | 2D | 2D | 2D | 2D | 2D | 2D |
| Slice Thickness | 0.4 mm | 1.0 mm | 0.8 mm | 1.7 mm | 1.0 mm | 0.8 mm |
| Distance Factor | -21% | 20% | ― | ― | 20% | ― |
| Slices | 48 Slices per Slab | 160 Slices per Slab | 208 Slices per Slab | 96 Slices per Slab | 160 Slices per Slab | 208 Slices per Slab |
| Acquisition Time | 4:31 min | 25 sec | 7:58 min | 1:05 min | 25 sec | 7:58 min |