The dielectric properties of biological tissues: I. Literature survey

Abstract

The dielectric properties of tissues have been extracted from the literature of the past five decades and presented in a graphical format. The purpose is to assess the current state of knowledge, expose the gaps there are and provide a basis for the evaluation and analysis of corresponding data from an on-going measurement programme.

Specific absorption rate in neonates undergoing magnetic resonance procedures at 1.5 T and 3 T

“…aThe permittivity (conductivity) ratio is (permittivity (conductivity) of newborn tissue)/( permittivity (conductivity) of adult tissue) at 130 MHz as reported by Peyman et al 18.bNewborn tissue permittivity (conductivity) values are the adult values (from References 20, 21, 22) multiplied by the appropriate ratio.cDensity values provided by Helmholtz Zentrum München.…”

“…Newborn tissue permittivity (conductivity) values are the adult values (from References 20, 21, 22) multiplied by the appropriate ratio.…”

Achieving plane‐wise uniform B1 amplitude in a 3D volume for high‐field MRI: A computer simulation study

“…[9]. The z component of the B 1 field does not contribute to spin excitation, but is needed to satisfy Eq.…”

“…The materials in the template were assumed to be uniform with a relative dielectric constant ⑀ ϭ 60 and a conductivity ϭ 0.5 S/m. These values approximately correspond to the average of the gray and white matters at 170 MHz (9). The lungs inside the template were assumed to have properties of free space.…”

“…Figure 3 shows the CP B 1 field in three orthogonal planes at 170 MHz, with the targeted field being field pattern I with z 0 ϭ 0 in Eq. [9] (the z position where B 1z field is zero) and using the parameters in Table 2. We anticipated variation in the field amplitude along the x direction according to Fig.…”