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Contrast Media Used in Computed Tomography

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Contrast Media Used in Computed Tomography Yadav P. et al., J. Harmoniz. Res. Med. and Hlth. Sci. 2018, 5(2), 14-19 Journal Of Harmonized Research (JOHR) Jou rnal Of Harmonized Research in Medical & Health Sci. 5(2), 2018, 14-19 ISSN 2395 – 6046 Review Article CONTRAST MEDIA USED IN COMPUTED TOMOGRAPHY 1* 2 1 3 Pankaj Yadav , Ashok Yadav , Prathibha Yadav , Akash Yadav 1Gajra Raja Medical College, Veer Savarkar Marg, Gwalior, Madhya Pradesh 474009. 2 Mahatmi Gandhi Memorial Medical College, A.B.Road, Indore, Madhya Pradesh 452001. 3IPS Academy, College of Pharmacy, Knowledge Village, A.B. Road, Rajendra Nagar, Indore, Madhya Pradesh 452012. Abstract : Contrast media (CM) are used in imaging techniques to enhance the differences between body tissues on images. The ideal contrast medium should attain a very high concentration in the tissues without producing any adverse effects. Unfortunately, this has not been possible so far and all CM have adverse effects. The increasing use of CM is likely to give rise to a wide range of pitfalls, including compliance with and appropriateness of indications for the use of CM themselves, the choice of the ‘best’ contrast agent, off-label use, evaluation of special populations of patients. Even more prominently it is the issue of informed consent which brings with it a duty to inform patients awaiting the administration of CM with regard to the nature of the procedure, the existence of alternative procedures, the extent of the risks relating to the use of CM and, finally, the risks relating to refusal of the procedure. All these issues may give rise to concerns about liability for failure to offer adequate information to patients or to carefully evaluate and balance the potential risks and benefits of the procedure or, finally, for being unprepared in the event of adverse reactions to CM, especially when these are severe and life-threatening. Educational and training programmes for radiologists are likely to shape change in the medical liability environment in the coming years. Keywords: Contrast media (CM), Computed Tomography, Radiocontrast Agents, Magnetic resonance imaging (MRI) Introduction: Contrast media (CM) enhance densities. Half of the approximately 76 million the quality of images, revolutionizing the computed tomographic and 34 million magnetic radiologist’s ability to differentiate soft-tissue resonance imaging examinations performed each year include the use of intravenous For Correspondence: contrast agents . Many advanced clinical imaging [email protected] applications were developed and refined with 1 Received on: March 2018 the use of intravenous contrast agents . Ideally, Accepted after revision: May 2018 contrast agents should be injected and DOI: 10.30876/JOHR.5.2.2018.14-19 eliminated from the body without additional effects on the patient. Ideally, CM should attain www.johronline.com 14 | P a g e Yadav P. et al., J. Harmoniz. Res. Med. and Hlth. Sci. 2018, 5(2), 14-19 a very high concentration in the tissues without resonance (MR) imaging, and ultrasound. producing any adverse effects. Unfortunately Often, contrast materials allow the radiologist to this has not been possible so far and all CM distinguish normal from abnormal conditions. have adverse effects. Contrast materials are not dyes that permanently Radiocontrast agents are substances used to discolor internal organs 2. They are substances enhance the visibility of internal structures in X- that temporarily change the way x-rays or other ray-based imaging techniques such as computed imaging tools interact with the body. tomography (contrast CT), projectional When introduced into the body prior to an radiography, and fluoroscopy. Radiocontrast imaging exam, contrast materials make certain agents are typically iodine, barium-sulphate or structures or tissues in the body appear different gadolinium based compounds. They absorb on the images than they would if no contrast external X-rays, resulting in decreased exposure material had been administered. Contrast on the X-ray detector. This is different from materials help distinguish or “contrast” selected radiopharmaceuticals used in nuclear medicine areas of the body from surrounding tissue. By which emit radiation 1. improving the visibility of specific organs, Magnetic resonance imaging (MRI) functions blood vessels or tissues, contrast materials help through different principles and thus utilizes physicians diagnose medical conditions. different contrast agents. These compounds Types of Contrast Agents used in CT work by altering the magnetic properties of There are four types of contrast agent used in nearby hydrogen nuclei. Although the currently CT: available contrast agents generally are 1. The type that is given considered to be safe, their use is not via intravenous (through a vein) injection completely without risk. Adverse effects vary 2. The type that is given orally from minor physiologic and mild allergic-like 3. The type that is given rectally reactions to rare but severe and life-threatening 4. A much less common type of contrast used events. Although the prevalence of these in CT is inhaled as a gas and used for reactions is low for both CT and MR imaging, special lung and brain imaging. This reactions to contrast media do occur, and rapid technique (called Xenon CT) is only evaluation and treatment of them requires available at a small number of locations designated and well-trained personnel and throughout the world and is only performed appropriate, readily available equipment and for rare cases. medications. Ideally, identification of patients CT Contrast Given Via Intravenous likely to experience adverse effects with Injection: Intravenous contrast is used in CT to contrast agents should occur before approval help highlight blood vessels and to enhance the and completion of these examinations. When an tissue structure of various organs such as the adverse event arises, knowledge of the types of brain, spine, liver and kidneys. "Intravenous" reactions that manifest and prompt treatment are means that the contrast is injected into a vein critical, and therefore, appropriate training must using a small needle. Some imaging exams of be provided to all individuals involved in the abdomen and gastrointestinal system use administration of contrast material. In the last both the intravenous iodine and orally few years, procedures employing CM have administered barium contrast for maximum tremendously increased 2. sensitivity. Contrast materials, also called contrast agents or The intravenous CT contrast is clear like water contrast media, are used to improve pictures of and has a similar consistency. It is typically the inside of the body produced by x- packaged in glass bottle or vial. A sterile rays, computed tomography (CT), magnetic syringe is used to draw it from the bottle or a www.johronline.com 15 | P a g e Yadav P. et al., J. Harmoniz. Res. Med. and Hlth. Sci. 2018, 5(2), 14-19 power injector is used to administer the Overall, iodine is safe and has been used for contrast. Typically between 75 cc to 150 cc many years and in millions of x-ray, CT and (about 2.5 oz. to 5 oz) of contrast is used angiogram studies without serious side effects. depending upon the patient's age, weight, area Iodine contrast increases the sensitivity of the being imaged and cardiovascular health 3. CT study. Thus the benefits of using iodine How does Intravenous CT Contrast Work? contrast typically outweigh the risks. Patients A small needle is first placed into a vein in the should inform the radiologist or technologist if hand or arm by the radiologist, technologist or a they have a history of allergies (especially to nurse and held in place with tape or a strap. medications, previous iodine injections, or Once the needle is in place, the vein is flushed shellfish), diabetes, asthma, a heart condition, with saline solution. Typically the contrast is kidney problems, or thyroid conditions. These loaded into a power-assisted injector, which conditions may indicate a higher risk of iodine injects the CT contrast using tubing through the reactions or problems with eliminating the needle into the body during a specific period in iodine after the exam 4. the CT exam. The injection is fully under the Oral CT Contrast: It is important that patients control of the technologist or radiologist. The consult the imaging location performing their injector is either mounted on a small trolley or CT exam for specific instructions to follow hung from a ceiling mounted suspension next to when contrast will be used. The information the CT scanner. The contrast may also be hand contained herein is only a general guideline. injected using a large syringe connected to the Oral contrast is often used to enhance CT needle via tubing. images of the abdomen and pelvis. There are Once the iodine contrast has been injected into two different types of substances used for oral the blood stream, it circulates through the heart CT contrast. The first, barium sulfate, is the and passes into the arteries, through the body's most common oral contrast agent used in CT. capillaries and then into the veins and back to The second type of contrast agent is sometimes the heart. As CT images are being acquired, the used as a substitute for barium and is called CT's x-ray beam is attenuated (weakened) as Gastrografin. they pass through the blood vessels and organs Barium contrast looks like and has a similar flush with the contrast. This causes the blood consistency as a milk shake. It is mixed with vessels and organs filled with the contrast to water and depending on the brand used, may "enhance" and show up as white areas on the x- have different flavors (for example, strawberry ray or CT images. The kidneys and liver or lemon). Gastrografin contrast is a water- eliminate the contrast from the blood. based drink mixed with iodine and has a tinted What Preparation is Needed Before yellow color.
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