Korean J Med Phys.  2009 Dec;20(4):244-252.

A Study on Compensation for Imaging Qualities Having Artifact with the Change of the Center Frequency Adjustment and Transmission Gain Values at 1.5 Tesla MRI

• Lee JS
• Goo EH
• Park CS
• Lee SY
• Lee HJ

Abstract

The purpose of this study is to compensate for susceptibility and a ferromagnetic body artifact using CFA and TGV on MR Imaging. A total of 30 patients (15 men and 15 women, mean age: 45 years) were performed on head and neck diseases. MR Unit used a 1.5T superconducting magnet (GE medical system, High Density). This study have investigated by changing with CFA and TGV (70, 90, 110, 130, 150) searching for compensation values about susceptibility and a ferromagnetic body artifact in 60 kg standards of body weight (p<0.05). As a quality results, Image qualities were obtained at different score from CFA and TGV (70, 90, 110, 130, 150=3.23+/-0.35, 4.31+/-0.02 4.23+/-0.21, 5.12+/-0.25, 7.13+/-0.72, 8.31+/-0.01, 5.21+/-0.15, 6.14+/-0.08, 5.23+/-0.72, 5.91+/-0.06, p<0.05). Absolute CNRs (TG, CNRpre, CNRpost) were acquired with (70:-1.44+/-0.11, -2.7+/-0.04, 90:-2.18+/-0.42, -4.41+/-0.43, 110:-2.89+/-0.43, -5.23+/-0.02, 130:-2.34+/-0.05, -5.26+/-0.01, 150: -2.09+/-0.08, -3.87+/-0.12, p<0.05). In conclusions, this study could be compensated for metal and flow artifacts surrounding the tissues having artifact by changing CFA and TGV.

Keyword

Transmission gain values; Center frequency adjustment; Artifacts; Absolute contrast to noise ratio

MeSH Terms

Artifacts
Body Weight
Compensation and Redress
Female
Head
Humans
Magnets
Male
Neck