Related Experiment Video
Updated: Feb 4, 2026
07:12
Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
Published on: January 19, 2020
9.9K
[Current Possibilities of Using Radiopharmaceuticals to Evaluate Cerebral Blood Flow].
Vestnik Rentgenologii I Radiologii
|September 25, 2018
Summary
Ceretec and Neurolite are optimal for evaluating cerebral perfusion via scintigraphy. Other agents like 123I-IMP and 201Tl-DDC are less practical due to cost and radiation, with 99mTc-DDC showing insufficient brain fixation.
Area of Science:
- Nuclear Medicine
- Radiopharmacology
Background:
- Cerebral perfusion disorders require accurate diagnostic tools.
- Neurotropic radiopharmaceuticals are crucial for scintigraphic evaluation.
Purpose of the Study:
- To compare the utility of various neurotropic radiopharmaceuticals for scintigraphic assessment of cerebral blood flow.
- To identify the most optimal agents for clinical practice.
Main Methods:
- Literature review across Scopus, Web of Science, PubMed, EMBASE, and Russian Science Citation Index.
- Comparative analysis of radiopharmaceutical properties including cost, radiation exposure, and brain fixation.
Main Results:
- Ceretec (99mTc-hexamethylpropyleneamine) and Neurolite (N,N-1,2-ethylenediylbis-L-cysteine-diethyl ether) identified as optimal agents.
- 123I-IMP and 201Tl-DDC present limitations due to high cost and radiation exposure.
- 99mTc-DDC exhibits insufficient short-term brain fixation, rendering it unsuitable for tomoscintigraphy.
Conclusions:
- Ceretec and Neurolite are the preferred radiopharmaceuticals for routine clinical scintigraphic evaluation of cerebral perfusion.
- Cost and radiation burden restrict the use of alternative agents like 123I-IMP and 201Tl-DDC.
- The short brain fixation of 99mTc-DDC limits its application in advanced imaging.
Related Concept Videos
01:29Blood Flow
76.0K
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
76.0K
01:17Autoregulation of Blood Flow
8.1K
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
8.1K
01:27Applications of Integration to Find Blood Flow
50
Blood flow through a cylindrical blood vessel can be mathematically described using the principles of laminar flow, a regime in which fluid moves smoothly in parallel layers. In this model, the velocity of the blood is not uniform across the cross-section of the vessel; rather, it varies with the radial distance from the center. The maximum velocity occurs along the central axis, decreasing progressively toward the vessel walls, where it reaches zero due to viscous drag.Approximating Blood...
50
01:29Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration
930
The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...
930
01:10Electrical Current
7.2K
Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
7.2K
01:26Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow
245
Chronic liver disease significantly impacts drug metabolism due to alterations in hepatic blood flow and enzyme accessibility. This disruption affects the body's pharmacokinetics—the movement and processing of drugs within the system. Key enzymes crucial for metabolizing medications become less accessible, changing how drugs are processed and utilized. Furthermore, liver disease influences the synthesis of plasma proteins, such as albumin and globulins, which play critical roles in drug...
245