Radiology - Technology Information Portal
Thursday, 28 March 2024
• Welcome to Radiology-TIP.com!
     • Sign in / Create account
 
 Radiology Database  - A - p5
SEARCH   
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 
Ab-Ac Ac-Ac Ac-Ac Ac-Ad Ad-Ai Al-Al Al-Am An-An An-An An-An An-An An-Ar Ar-As At-At At-Au Ax-Ax
Adventitia
Three tissue layers called tunicae, or coats, surround the lumen of an artery. The adventitia (outer coat) is the outermost layer of an arterial wall and is composed of connective tissue containing elastic fibers and another layer of protein called the external basement membrane. Smooth muscle cells comprise the tunica media, or middle coat. The muscle cells contract or relax to constrict or dilate the artery.

See also Coronary Angiogram, Angiography, Angioplasty, and Cardiac Catheterization.
• View DATABASE results for 'Adventitia' (3).Open this link in a new window.
Adverse Reaction
Adverse reactions on contrast agents are rare, but like all other pharmaceuticals, contrast media are not completely without side effects.
Adverse effects to contrast media include allergic symptoms, anaphylactoid reactions, chemotoxic reactions, idiosyncratic reactions, contrast-induced nephropathy, iodide-induced hyperthyroidism and local tissue damage. An adverse reaction can be related to dose, the toxicity, and the physio-chemical properties of the contrast agent, for example osmolality, viscosity, and hydrophilicity.
Side effects such as a metallic taste in the mouth, generalized warmth or flushing, nausea and vomiting, increase with rapid flow and large volume of the injected agent. Although venous tolerance is usually good, there have been reports of sensation like burning, stinging or numbness and of venospasm.

Characterization of adverse reactions include:
Allergic drug reactions never occurs on the first exposure, but it can occur even with small amounts.
Chemotoxic reactions result from the properties and characteristics of the used drug, the dose, speed of injection, etc. Hemodynamic disturbances and injuries to organs or vessels perfused by the contrast agent are included.
Idiosyncratic reactions can occur on first exposure to the contrast medium. And unlike a side effect, the reaction occurs only in susceptible individuals, probably due to a genetic or metabolic abnormality.
• 
View NEWS results for 'Adverse Reaction' (1).Open this link in a new window.
• View DATABASE results for 'Adverse Reaction' (12).Open this link in a new window.
Aerosol Method
The aerosol method uses technetium-labeled DTPA crushed by an atomizer into small particles. This aerosol inhales the patient during the aerosol ventilation scintigraphy to study airways disease.
• View DATABASE results for 'Aerosol Method' (2).Open this link in a new window.
Aerosol Ventilation Scintigraphy
An aerosol ventilation scintigraphy is a nuclear medical imaging procedure that records the distribution of an inhaled radioactive aerosol within the bronchopulmonary system.
Aerosol ventilation in the gamma camera section does not constitute a significant radiation hazard to personnel. Patient compliance is an important factor to minimizing the dose. Clear instructions and practice are a vital part of the diagnostic imaging procedure.

See also Lung Scintigraphy, Aerosol Method, Gas Ventilation Scintigraphy and Inhalation Scintigraphy.
• View DATABASE results for 'Aerosol Ventilation Scintigraphy' (6).Open this link in a new window.
Air Kerma
Air KERMA (Kinetic Energy Released per unit MAss of air) measures the amount of radiation energy in air, unit is J/kg. This include the initial kinetic energy of the primary ionizing particles such as photoelectrons, Compton electrons, positron//negatron pairs from photon radiation, and scattered nuclei from fast neutrons, when for example air is irradiated by an x-ray beam. J/kg (gray) is also the unit of the radiation quantity 'Absorbed Dose'.
• View DATABASE results for 'Air Kerma' (4).Open this link in a new window.
Ab-AcAc-AcAc-AcAc-AdAd-AiAl-AlAl-AmAn-AnAn-AnAn-AnAn-AnAn-ArAr-AsAt-AtAt-AuAx-Ax
 
Share This Page
Facebook
Twitter
LinkedIn

Look
      Ups
Radiology - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • Medical-Ultrasound-Imaging
Copyright © 2008 - 2024 SoftWays. All rights reserved.
Terms of Use | Privacy Policy | Advertising
 [last update: 2023-11-06 02:01:00]