10 EH @ MEDICA Latest developments in contrast media utilisation Striking the balance between diagnostic efficacy and patient safety remains critical when uti- lising iodinated contrast media to deliver the best imaging out- comes. Currently, 300 million CT exams are conducted across the world every year, with 40% contrast-enhanced exam. While playing a crucial role in diag- nosis and treatment of disease, CT expert Efthimios Agadakos believes the medical profession has a duty to do its utmost to minimize patient from contrast media. risk A session at ECR 2024 in Vienna heard about latest developments, trends and breakthroughs in contrast media utilisation in CT, MRI and ultrasound imaging, and explored the question of how do- sage may be further lowered using modern protocols. Focussing on CT imaging, Agadakos offered in- sights into approaches he feels can contribute to enhanced patient safety and better-informed clinical decisions. As Chief Radiographer at Laiko General Hospital in Athens, he highlighted the role of imaging in modern clinical practice, offering invaluable diagnostic information across a wide spectrum of medical specialities. ‘It can improve visual- isation of anatomy and pathology, enhance lesion detection and vas- culature, identify ischemic con- ditions, enhance surgical planning and guidance as well as monitoring treatment response,’ he said. ‘But it is imperative to acknowledge the associated risk of iodine in contrast media.’ Why a lower dose matters Risks from radiation levels and ad- verse reactions mean that optimal iodine delivery is pivotal in yield- ing precise and reliable diagnosis, while maintaining patient safety and healthcare efficiency. Agada- kos said that lower iodine dose can reduce risk of allergic reactions and contrast-induced nephropathy, decrease vascular complications, enhance patient comfort and ex- perience, minimise radiation ex- posure, and optimise resource utili- sation. Protocols can also be adapted for children, the elderly and for patients that need repeat CT scans. protocols and smart injection sys- tems. ‘Iterative reconstruction al- gorithms enable the use of lower tube currents or voltages, driving lower iodine doses without diag- nosing compromising diagnostic accuracy,’ he told delegates. One study using a low KV and low iodine dose with abdominopelvic CT achieved a 40% iodine dose re- duction and 50% radiation dose re- duction. ‘Meanwhile, dual-energy CT allows for better iodine contrast enhancement at lower doses, thus reducing the total iodine load on the patients,’ added Agadakos. Perfect timing Artificial Intelligence applications assist in reducing need for IVCM (intravenous contrast media) by analysing patient data such as weight, age, renal function and medical history to tailor person- alized contrast doses for optimal imaging, the contrast-induced risks. and minimise The expert went into detail on a range of options that can be ap- plied to help reduce iodine dose when using CT. These include tube voltage selection (automated or manual), iterative reconstruction algorithms, cinematic rendering, Dual Energy CT, AI applications, Photon-counting CT, personalized Machine learning algorithms can predict the required iodine dose and flow weight, select low KV or dual-energy CT scanning based on individual patient characteristics. When using personalized proto- cols, he said bolus triggering is a “must” with contrast-enhanced CT as it facilitates ‘perfect timing for contrast enhancement, produces accurate imaging and reduces the need for higher iodine concen- trations.’ Meanwhile, photon count- ing CTA facilitates lower iodine dose by enhancing the detection of contrast media, particularly in small vessels, he added. Finally, advanced contrast injectors equipped with intelligent tech- nologies offer precise management of contrast administration. Agada- kos said the aim is to strike a bal- ance between diagnostic efficacy, image quality and patient safety and comfort. ‘By embracing the la- test advancements in CT tech- nology and adopting tailored strat- egies for iodine dose reduction, we can push the boundaries of diag- nostic excellence while prioritizing patient safety,’ he continued. ‘But we must continue to col- laborate, innovate, and elevate the standard of patient-centred care in medical imaging, ensuring that every patient receives the highest quality of care and a positive and reassuring experience in the CT de- partment.’ The session also heard from Peter Murphy, Unit Manager, MRI, PET CT & DXA, Alliance Diagnostic Medical Imaging Ireland and Cork University Hospital about current issues with Gadolinium-Based agents with MRI, and Barbara Kraus from Wolkersdorf, Austria, speaking on indications and proto- cols for ultrasound contrast agent administration. ■ Efthimios Agadakos Efthimios Agadakos chief radiogra- pher of the Medical Imaging Depart- ment at Laiko General Hospital, Athens, Regional Director Europe ISRRT (International Society of Radi- ographers and Radiological Technol- ogists) and President of the Panhellenic Society of Radiological Technologists Greece. His areas of in- terest are in CT, radiation protection and patient safety. Awarded a MSc in Health Services Management from the National School of Public Health in Athens, he is currently completing his PhD thesis in Medicine at the University of Athens on low radiation dose protocols in CT. New PET technique reveals pancreas tumors A new PET scan reliably detects benign tumors in the pancreas, according to research led by Radboud university medical center. The study in adults was published in the Journal of Nuclear Medicine. Earlier results from pediatric pa- tients were also published in this journal. Current scans often fail to detect these insulinomas, even though they cause symptoms due to low blood sugar levels. Once the tumor is found, surgery is possible. The pancreas contains cells that produce insulin, beta cells. Insulin helps the body absorb sugar from the blood and store it in places like muscle cells. This regulates blood sugar levels. In rare cases, the beta cells malfunction, resulting in a be- nign tumor called an insulinoma. This almost never spreads, but it still causes problems due to excess- ive insulin production, leading to low blood sugar. ‘People with this condition have little energy due to low blood sugar and often faint’, explains Marti Boss, first author of the study. ‘It‘s a very challenging disease. It often takes a long time before patients get a diagnosis. We can perform blood tests, but they can‘t confirm if a tumor is the cause or where it‘s located. Various scans like CT, MRI, and PET are available, but don’t always show the insulinomas.’ Removing the tumor surgically re- solves the problem, but first, the tumor‘s location must be known. Martin Gotthardt, professor of Nu- clear Medicine at Radboudumc, ex- plains: ‘In the past, surgeons would start cutting away portions of the pancreas until they found the tumor. If it was at the end, the en- tire pancreas would be gone. You can live without a pancreas, but you‘d struggle with severe diabetes and would constantly have to man- age your blood sugar. So, a better scan was urgently needed.’ Gotthardt and his team developed a completely new scan, the so- called Exendin-PET scan, which allows for the precise localization of insulinomas. They previously published results from a study in children, where the insulinoma is congenital. Now, they present find- ings from a study in adults, where the insulinoma developed grad- ually. In the study, 69 adult patients with suspected insulinoma participated. The Exendin-PET scan detected tu- mors in 95% of the patients, com- pared to 65% with the current PET scan. When combined with CT and MRI, the current PET scan usually detected the tumor, but in 13% of cases, the insulinoma was only vis- ible on the new scan. Boss adds: ‘We believe the new scan can re- place all other scans. All the insuli- nomas we found with the new scan were removed, and all those pa- tients were completely cured after surgery, even though some had been sick for decades.’ The new scan is based on a sub- stance found in the saliva of the Gila monster, a type of lizard native to desert areas in the United States. Gotthardt explains: ‘We knew this substance specifically binds to a molecule on these tumors, the GLP1 receptor. The substance from the saliva wasn’t very stable in the human body, so we created a more chemically stable version, called Exendin. We then attached a radio- active substance to it, so it could be visible on a PET scan. Now, this mildly radioactive Exendin appears to perfectly detect insulinomas.’ The next step is to introduce the Exendin-PET scan into clinics as the standard scan for people sus- pected of having an insulinoma. Researchers will now assess how the scan improves patients‘ quality of life and how much money can be saved if other scans, like CT and MRI, are no longer needed. In ad- dition, Gotthardt‘s team is investi- gating the potential use of Exendin for the treatment of insulinomas in a new research project called Light- Cure. ■ Source: Radboudumc Publisher mgo fachverlage GmbH & Co. KG E.-C.-Baumann-Str. 5 95326 Kulmbach/Germany Phone +49 (0) 9221 949-311 Fax +49 (0) 9221 949-377 Managing Directors: Eva-Maria Bauch, Stephan Behrens Editor and Production Manager: Tim Hofmann (TH) Phone: +49 (0) 9221 949-176 E-Mail: redaktion@european-hospital.com Editor: Wolfgang Behrends (WB) Founded by Heinz-Jürgen Witzke ISSN 0942-9085 Correspondents Austria: Michael Krassnitzer (MK) Germany: Cornelia Wels-Maug (CWM) Dr Christina Czeschik (CC) Great Britain: Mark Nicholls (MN) Spain: Mélisande Rouger (MR) USA: Cynthia E. 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