NDLI: Discrimination between red blood cell and platelet components of blood clots by MR microscopy

Content Provider	Springer Nature Link
Author	Vidmar, Jernej Serša, Igor Kralj, Eduard Tratar, Gregor Blinc, Aleš
Copyright Year	2008
Abstract	Magnetic resonance imaging (MRI) of pulmonary emboli obtained ex vivo, verified by immunohistochemistry, showed that platelet layers display brighter signal intensity than areas containing predominantly red blood cells (RBC) in T 1-weighted MRI. These results were surprising since platelets do not contain paramagnetic haemoglobin that would enhance magnetic relaxation. Our assumption was that the fibrin meshwork areas with entrapped RBC retain abundant extracellular space filled with serum, whereas platelets regroup into tight aggregates lacking serum, essentially mimicking solid tissue structure, rich with cellular proteins that enhance T 1-relaxation. Our hypothesis was examined by MRI and NMR relaxometry of in vitro RBC suspensions and sedimented platelets, as well as by MRI of model clots and pulmonary emboli obtained ex vivo. Pure sedimented platelets exhibited shorter proton spin lattice relaxation times (T 1 = 874 ± 310 ms) than those of venous blood of a healthy male with 40% haematocrit (T 1 = 1277 ± 66 ms). T 1-values of RBC samples containing high haematocrit (≥80%) resembled T 1 of platelet samples. In T 1-weighted spin-echo MRI echo time and repetition time (TE/TR = 10/120 ms) the ratio of signal intensities between a non-retracted whole blood clot (with a haematocrit of 35%) and a pure platelet clot was 3.0, and the ratio between a retracted whole blood clot with an estimated haematocrit of about 58% and a pure platelet clot was 2.6. We conclude that T 1-weighted MRI can discriminate between platelet layers of thrombi and RBC-rich areas of thrombi that are not compacted to a haematocrit level of ≥80%.
Starting Page	1235
Ending Page	1240
Page Count	6
File Format	PDF
ISSN	01757571
Journal	European Biophysics Journal
Volume Number	37
Issue Number	7
e-ISSN	14321017
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-05-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MR microscopy Pulmonary emboli In vitro clot Platelet aggregates Nanotechnology Membrane Biology Neurobiology Biochemistry Cell Biology Biophysics/Biomedical Physics
Content Type	Text
Resource Type	Article
Subject	Medicine Biophysics

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