Magnetic Properties of Polyatomic Molecules. I. Magnetic Susceptibility of H2O, NH3, CH4, H2O2

Arrighini, G. P.; Maestro, M.; Moccia, R.

doi:10.1063/1.1670155

Cited by 143 publications

(45 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, we need the absolute value of the susceptibility of water and its temperature dependence. These, however, have been a long-standing issue of research [1,19,20,21,22,23,24,25,26]. To obtain the absolute value of the susceptibility, we use the value -9.032 ppm for the susceptibility of water at 20 • C quoted in [1], but we have to caution that our density-specific value critically hinges on this number.…”

Section: Density Measurements and Absolute Susceptibilitymentioning

confidence: 99%

Magnetic properties of materials for MR engineering, micro-MR and beyond

Wapler

Leupold

Dragonu

et al. 2014

Journal of Magnetic Resonance

101

View full text Add to dashboard Cite

We present the results of a systematic measurement of the magnetic susceptibility of small material samples in a 9.4 T MRI scanner. We measured many of the most widely used materials in MR engineering and MR micro technology, including various polymers, optical and substrate glasses, resins, glues, photoresists, PCB substrates and some fluids. Based on our data, we identify particularly suitable materials with susceptibilities close to water. For polyurethane resins and elastomers, we also show the MR spectra, as they may be a good substitute for silicone elastomers and good casting resins.

show abstract

Section: Density Measurements and Absolute Susceptibilitymentioning

confidence: 99%

Magnetic properties of materials for MR engineering, micro-MR and beyond

Wapler

Leupold

Dragonu

et al. 2014

Journal of Magnetic Resonance

101

View full text Add to dashboard Cite

show abstract

“…Here, 0:587 Â 10 À6 mL=g is the mass susceptibility of globin relative to vacuum in CGS units (53,54); 4p is the unit conversion from CGS to SI units; and À9035 ppb is the water volume susceptibility relative to vacuum (55). X p ¼ À37:7 ppb is the oxyhemoglobin and blood plasma volume susceptibility (12).…”

mentioning

confidence: 99%

Quantitative susceptibility mapping‐based cerebral metabolic rate of oxygen mapping with minimum local variance

Zhang

Cho

Zhou

et al. 2017

Magnetic Resonance in Med

View full text Add to dashboard Cite

Purpose: The objective of this study was to demonstrate the feasibility of a cerebral metabolic rate of oxygen (CMRO 2 ) mapping method based on its minimum local variance (MLV) without vascular challenge using quantitative susceptibility mapping (QSM) and cerebral blood flow (CBF). Methods: Three-dimensional multi-echo gradient echo imaging and arterial spin labeling were performed in 11 healthy subjects to calculate QSM and CBF. Minimum local variance was used to compute whole-brain CMRO 2 map from QSM and CBF. The MLV method was compared with a reference method using the caffeine challenge. Their agreement within the cortical gray matter (CGM) was assessed on CMRO 2 and oxygen extraction fraction (OEF) maps at both baseline and challenge states. Results: Mean CMRO 2 (in mmol/100 g/min) obtained in CGM using the caffeine challenge and MLV were 142 6 16.5 and 139 6 14.8 mmol/100 g/min, respectively; the corresponding baseline OEF were 33.0 6 4.0% and 31.8 6 3.2%, respectively. The MLV and caffeine challenge methods showed no statistically significant differences across subjects with small ( < 4%) biases in CMRO 2 and OEF values. Conclusions: Minimum local variance-based CMRO 2 mapping without vascular challenge using QSM and arterial spin labeling is feasible in healthy subjects. Magn Reson Med 79:172-179,

show abstract

“…The reported magnetic susceptibility of flour, ¹8.1 © 10 ¹7 emu, 15 is similar to that of water (¹7.2 © 10 ¹7 emu), 16 the primary constituent of the human body, and that of cells (¹7.2 © 10 ¹7 emu). 17 The magnetic susceptibility of rice is ¹8.2 © 10 ¹7 emu.…”

Section: Discussionmentioning

confidence: 62%

Flour Pads: Devices to Improve CHESS Fat Suppression

et al. 2014

View full text Add to dashboard Cite

Purpose: We compared the suppression of lingering fat signals in chemical shift selective (CHESS) images by pads filled with flour and pads filled with rice in a phantom and human subjects.Materials and Methods: First, we prepared a phantom by creating an empty space in a mass of lard and filling the space with air, rice, or flour. Then, we obtained MR images of the phantoms in the center of the magnetic field and at a position 8 cm to the left (off-center) to compare lingering fat signals. MR images of the knee were obtained in 10 healthy volunteers using CHESS after placing a polyurethane sponge pillow, rice pad, or flour pad in the popliteal space under the flexed knee. We visually assessed the number of areas with lingering fat signals and the statistical differences among the groups were assessed using Tukey's test.Results: Similarly to rice, flour clearly decreased lingering fat signals in the phantom study. A similar effect was obtained in the off-center images. In the volunteer study, the mean number of areas with lingering fat signals was 2.5 with a sponge pillow, 0.5 with the rice pad, and 0.3 with the flour pad. Those numbers were significantly different using flour pad and rice pad compared with sponge pillow (P < 0.001). No significant differences were seen between flour pads and rice pads (P = 0.662).Conclusion: Flour pads can suppress lingering fat signals in CHESS images.

show abstract

Magnetic Properties of Polyatomic Molecules. I. Magnetic Susceptibility of H2O, NH3, CH4, H2O2

Cited by 143 publications

References 25 publications

Magnetic properties of materials for MR engineering, micro-MR and beyond

Magnetic properties of materials for MR engineering, micro-MR and beyond

Quantitative susceptibility mapping‐based cerebral metabolic rate of oxygen mapping with minimum local variance

Flour Pads: Devices to Improve CHESS Fat Suppression

Contact Info

Product

Resources

About