Related Experiment Video
Updated: May 10, 2026
Utilizing 3D Printing Technology to Merge MRI with Histology: A Protocol for Brain Sectioning
Published on: December 6, 2016
MRI of Thiel-embalmed human cadavers
Mariana J Gueorguieva1, Desmond T B Yeo, Roos Eisma
1Institute for Medical Science and Technology, University of Dundee, Dundee, Scotland, UK.
Purpose:
To explain the observed considerable loss of signal and contrast when Thiel-embalmed human cadavers are imaged using clinical magnetic resonance imaging (MRI) sequences, especially those based on spin-echo MRI.
Materials And Methods:
All cadavers were imaged with a medical 1.5T scanner using standard MRI sequences. Dual angle B1+ magnitude mapping and electromagnetic (EM) simulations that characterize the radiofrequency (RF) penetration in a male human body model (HBM) were carried out for a range of tissue conductivities.
Results:
The EM simulations show that RF penetration issues begin to affect the image quality for values of electrical conductivity as low as 2.6 S/m. The electrical conductivity values of the embalming fluids were found to be within the range of 5-10.6 S/m, thus strongly suggesting that the observed loss in signal and contrast is due to diminished RF penetration inside the cadavers. Furthermore, it was demonstrated that gradient-echo (GRE)-based MRI sequences perform better than spin-echo (SE)-based sequences, as they are less susceptible to imperfections in the flip angle that are inevitably present when imaging Thiel cadavers.
Conclusion:
The diminished signal and contrast observed when imaging Thiel-embalmed human cadavers may be attributed to the high conductivity of the embalming liquids.
Insights
High conductivity of embalming fluids in Thiel-embalmed cadavers causes signal loss in magnetic resonance imaging (MRI). Electromagnetic simulations confirm diminished radiofrequency (RF) penetration, impacting image quality, especially with spin-echo sequences.
Area of Science:
- Medical Imaging
- Biophysics
Background:
- Thiel-embalmed human cadavers are used for anatomical study.
- Clinical magnetic resonance imaging (MRI) sequences often show signal and contrast loss with these specimens.
Purpose of the Study:
- To elucidate the reasons for signal and contrast reduction in Thiel-embalmed cadavers during MRI.
- To investigate the impact of embalming fluid conductivity on MRI signal.
Main Methods:
- Human cadavers were imaged using a 1.5T MRI scanner.
- Electromagnetic (EM) simulations and dual-angle B1+ mapping were performed to assess radiofrequency (RF) penetration.
- Tissue conductivity was analyzed across a range of values.
Main Results:
- EM simulations indicated RF penetration issues arise at electrical conductivity as low as 2.6 S/m.
- Thiel embalming fluids exhibited conductivity between 5-10.6 S/m, correlating with signal loss.
- Gradient-echo (GRE) sequences showed better performance than spin-echo (SE) sequences due to reduced susceptibility to flip-angle variations.
Conclusions:
- The high electrical conductivity of Thiel embalming liquids is the likely cause of diminished signal and contrast in MRI.
- Understanding these effects is crucial for optimizing MRI protocols for Thiel-embalmed cadavers.
Related Concept Videos
01:24Magnetic Resonance Imaging
01:14Imaging Studies I: CT and MRI
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...