𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Gradient-Echo Line Scan Imaging Using 2D-Selective RF Excitation

✍ Scribed by Jürgen Finsterbusch; Jens Frahm

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
405 KB
Volume
147
Category
Article
ISSN
1090-7807

No coin nor oath required. For personal study only.

✦ Synopsis

A gradient-echo line scan imaging technique was developed which employs two-dimensional spatially selective radiofrequency (2DRF) pulses for consecutively exciting individual columns of transverse magnetization, i.e., image lines. Although a variety of trajectories are possible for 2DRF excitation, the current implementation involved a blipped-planar trajectory in conjunction with additional saturation RF pulses to suppress side excitations above and below the desired image section, i.e., along the blip direction of the 2DRF pulse. Human brain imaging at 2.0 T (Siemens Vision, Erlangen, Germany) resulted in measuring times of 5.2 s for a 5-mm section at 1.0 x 1.0 mm in-plane resolution. Functional neuroimaging of the motor cortex at 1.2 s temporal resolution and 0.78 x 1.56 mm in-plane resolution exploited the capability of imaging inner volumes (here a 25-mm strip) without signal aliasing.

📜 SIMILAR VOLUMES

Coherence Selection and Excitation Sculp
Coherence Selection and Excitation Sculpting Using RF-Gradients in Selective 1D Experiments and Nonselective 2D Experiments
✍ Sami Heikkinen; Erkki Rahkamaa; Ilkka Kilpeläinen 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 158 KB

The B 0 gradient pulses can be replaced with long high-power pulses (RF-gradients) in z-rotation composite sandwiches. By doing this, practically all B 0 gradient-based pulse sequences can be performed with instruments lacking a field gradient accessory. We have implemented RF-gradients into selecti

Use of RF Gradients in Excitation Sculpt
Use of RF Gradients in Excitation Sculpting, with Application to 2D HSQC
✍ Sami Heikkinen; Erkki Rahkamaa; Ilkka Kilpeläinen 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 147 KB

The gradient pulses of double-GBIRD can be replaced with are flipped, the J( 13 C, 1 H) continues evolution after the first high-power spin-lock pulses ( RF gradients ) in z-rotation com-GBIRD cluster. To eliminate this, an inversion pulse for posite sandwiches. Implementation of this double-spin-lo