Contrast Agent Delivery
Contrast Agent Delivery - Related Videos
11:27
Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
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Cited by 5 •
2016
This protocol describes the preparation and characterization of a dendrimeric magnetic resonance imaging (MRI) contrast agent that carries cyclen-based macrocyclic chelates coordinating paramagnetic gadolinium ions. In a series of MRI experiments in vitro, this agent produced an amplified MRI signal when compared to the commercially available monomeric analogue.
06:54
MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent
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Cited by 3 •
2013
To demonstrate MR cancer molecular imaging with a small peptide targeted MRI contrast agent specific to clotted plasma proteins in tumor stroma in a mouse prostate cancer model.
07:15
In vivo Macrophage Imaging Using MR Targeted Contrast Agent for Longitudinal Evaluation of Septic Arthritis
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Cited by 2 •
2013
We demonstrate how to perform macrophage MR imaging using ultrasmall superparamagnetic contrast agent (USPIO) in septic arthritis, allowing an initial and longitudinal in vivo non-invasive evaluation of macrophages infiltration and an assessment of therapy efficacy.
02:24
Microinjection-Based Delivery of a Therapeutic Agent into an Awake Rodent Brain
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2025
Source: Poland, R. et al. Rodent Brain Microinjection to Study Molecular Substrates of Motivated Behavior. J. Vis. Exp. (2015)In this video, a water-filled microinjection setup consisting of a syringe and microinjector tubing is used for precise drug delivery. A rat with a pre-implanted guide cannula undergoes targeted brain microinjection, enabling accurate administration of therapeutic agents in awake animals with minimal tissue damage.
12:17
Construction and Implantation of a Microinfusion System for Sustained Delivery of Neuroactive Agents.
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Cited by 4 •
2008
As neuroscience inquiry becomes more sophisticated, investigation of brain structures and circuitry requires improved levels of accuracy and higher resolution. We have developed a method for the preparation and implantation of a chronic infusion system within the brain utilizing a borosilicate microcannula with a tip diameter of 50 microns.
FAQs
Distribution depends on how blood flow, vascular permeability, and molecular binding shape movement from the circulation into tissue. Blood flow influences delivery, permeability affects how readily an agent reaches tissue, and binding can increase retention at relevant sites. Together, these properties determine the contrast pattern and can help distinguish tumor regions from surrounding structures during image interpretation.
The delivery strategy supplies an agent whose tissue distribution changes signals detected by magnetic resonance imaging, computed tomography, or ultrasound. The underlying biological distribution may be similar, but the observed contrast depends on the imaging modality’s signal detection. Examining distribution through different modalities can therefore provide distinct views of tumors and nearby structures.
Targeted formulations are designed to improve imaging specificity by directing contrast toward relevant tumor-associated sites or features. Greater specificity can make tumor tissue easier to distinguish from healthy tissue and may reduce exposure of non-target tissue. In cancer research, this matters when investigators need to characterize lesions or assess changes while limiting unnecessary distribution.
The main pathways are intravenous and localized administration. With intravenous delivery, the agent enters circulation and can travel through the vasculature before imaging. Localized administration places it closer to the region of interest. The selected pathway affects how distribution is observed and helps align delivery with the tissue being investigated.
It supports tumor detection, characterization, treatment planning, and response monitoring. These uses correspond to different research questions: locating abnormal tissue, examining its features, informing how treatment may be planned, or tracking changes after intervention. Because delivery influences the visible contrast pattern, the approach can contribute to both initial assessment and follow-up evaluation.
A distribution pattern can provide clues about blood flow, vascular permeability, or molecular binding, not merely where an abnormal structure appears. Those signals help researchers characterize the tumor environment and surrounding tissue. In response studies, changes in the pattern may also support evaluation of how the tumor or its associated biology changes during treatment.