About ERA

Eastern Radiological Associates (ERA) is a professional partnership of board certified radiologists (doctors trained in medical imaging and image interpretation) who have been providing radiology professional services since 1970. Our mission is simple. Eastern Radiological Associates serves the patient and physician community of the region (Montana, Wyoming, and surrounding) by providing the highest quality diagnostic imaging and interventional services in a caring and compassionate atmosphere. Did you know? We are involved in the Yellowstone community… learn...

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Meet the Radiologists


Joseph Dillard, MD

Joseph Dillard is a board-certified radiologist and he is fellowship/sub-specialty trained in neuroradiology and interventional and vascular radiology.

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What is CT Angiography? Angiography is a minimally invasive medical test that helps physicians diagnose and treat medical conditions. Angiography uses one of three imaging technologies and, in most cases, a contrast material injection is needed to produce pictures of blood vessels in the body. Angiography is performed using: x-rays with catheters computed tomography (CT) magnetic resonance imaging (MRI) CT angiography uses a CT scanner to produce detailed images of both blood vessels and tissues in various parts of the body. An iodine-rich contrast...

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MRI Services


Magnetic resonance imaging (MRI) is a technology that uses radio waves and a powerful magnet linked to a computer to create detailed pictures of internal organs, blood vessels, muscles, joints, tumors, areas of infection, and more. These very high quality pictures can show the difference between normal and diseased soft tissues of the body, making it especially useful for a wide range of different types of imaging, including neurological and musculoskeletal. If necessary, a contrast agent may be used to help your doctor to see the MRI image more...

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X-RAY technology lets doctors see straight through human tissue to examine broken bones, cavities and swallowed objects. Modified X-ray procedures can be used to examine softer tissue, such as the lungs, blood vessels or the intestines. The X-ray camera uses the same film technology as an ordinary camera, but X-ray light sets off the chemical reaction instead of visible light.