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.

Características y Beneficios


  • 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

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

syngo MR B15
syngo MR D11

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.

Applications training