Duvvuri U, Charagundla S R, Kudchodkar S B, Kaufman J H, Kneeland J B, Rizi R, Leigh J S, Reddy R
Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, USA.
Radiology. 2001 Sep;220(3):822-6. doi: 10.1148/radiol.2203001662.
A fast spin-echo sequence weighted with a time constant that defines the magnetic relaxation of spins under the influence of a radio-frequency field (T1(rho)) was used in six subjects to measure magnetic resonance (MR) relaxation times in the knee joint with a 1.5-T MR imager. A quantitative comparison of T2- and T1(rho)-weighted MR images was also performed. Substantial T1(rho) dispersion was demonstrated in human articular cartilage, but muscle did not demonstrate much dispersion. T1(rho)-weighted images depicted a chondral lesion with 25% better signal-difference-to-noise ratios than comparable T2-weighted images. This technique may depict cartilage and muscular abnormalities.
在六名受试者中，使用了一种快速自旋回波序列，该序列由一个时间常数加权，该时间常数定义了在射频场（T1（ρ））影响下自旋的磁弛豫，以通过1.5-T磁共振成像仪测量膝关节的磁共振（MR）弛豫时间。还对T2加权和T1（ρ）加权的MR图像进行了定量比较。在人体关节软骨中显示出明显的T1（ρ）离散，但肌肉中没有显示出太多离散。与可比的T2加权图像相比，T1（ρ）加权图像描绘软骨损伤的信号差与噪声比提高了25%。该技术可能描绘软骨和肌肉异常。
