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TWIST

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Visualization of lower leg vessels, collaterals in a patient with stenoses and occlusions
TWIST

Visualization of lower leg vessels, collaterals in a patient with stenoses and occlusions

Visualization of lower leg vessels, collaterals in a patient with stenoses and occlusions
MR angiography of the lower leg vessels with TWIST
Large FOV pulmonary MR angiography with TWIST
Large FOV MRA of the supra-aortic, carotids and cerebral vessels with TWIST
TWIST MRA shows filling of the vessels and basilar artery aneurysm
TWIST shows left foot AVM and delayed and reduced filling of the right lower leg vessels
TWIST shows the AV shunt and multiple stenoses of the brachial vein
Large FOV MRA of the supra-aortic, carotids and cerebral vessels with TWIST
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TWIST (Time-resolved angiography With Interleaved Stochastic Trajectories) is a time-resolved 3D MRA technique with very high temporal (sub-second) and spatial resolution (sub-millimeter) which will allow to capture the multiple arterial, mixed, venous phase images during the passage of a contrast agent through the vascular anatomy.

Features & Benefits

Features

  • Substantial reduction in gadolinium chelate dose
  • The ability to obtain multiple phases
  • No need for a test bolus (or any other kind of bolus timing)
  • iPAT in two directions with a factor up to 9 (optional with iPAT extensions)


Clinical Applications

  • Peripheral angiography (Better hemodynamic evaluation of stenosis and collaterals, elimination of venous contamination)
  • Dynamic cerebral MRA (Evaluation of cerebral AVMs, vascular malformations)
  • Dynamic carotid, vertebral MRA (steal phenomenon, stenosis, collaterals…)
  • Dynamic pulmonary MRA
  • Dynamic renal MRA
  • Dynamic mesenteric, portal MRA
  • Dynamic Aortography (Aortic dissection visualization, differentiation of false and true lumen with the help of dynamic MRA)


Additional Information
TWIST is based on special k-space sampling. In this setting, k-space is divided into two regions. The centrally located region of k-space provides information regarding image contrast, the peripherally located aspect of k-space contributes principally to high spatial resolution. The main factor contributing to the acceleration of the sequence acquisition in this particular imaging approach is the fact that k-space lines in the center are more frequently sampled than are the k-space lines in the periphery during the passage of the contrast medium bolus through the covered 3D volume.

General Requirements

System

  • Biograph mMR
  • MAGNETOM Aera
  • MAGNETOM Altea
  • MAGNETOM ESSENZA
  • MAGNETOM Espree
  • MAGNETOM Lumina
  • MAGNETOM Prisma
  • MAGNETOM Sempra
  • MAGNETOM Skyra
  • MAGNETOM Sola
  • MAGNETOM Spectra
  • MAGNETOM Symphony, A Tim System
  • MAGNETOM Trio, A Tim System
  • MAGNETOM Verio
  • MAGNETOM Vida
  • MAGNETOM Amira
  • MAGNETOM Avanto
  • MAGNETOM Prismafit
  • MAGNETOM Skyrafit
  • MAGNETOM Avantofit
  • MAGNETOM Solafit
  • MAGNETOM Vidafit

Minimum Software Version

syngo MR B15
syngo MR D11

Other

Memory extension may be necessary

 

Please Note: Additional technical pre-requisites may apply. Upon receiving your request, your local Siemens representative will clarify whether your system meets the requirements.

Recommendations

Applications training