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

John Bisges

John D. Bisges, MD

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Services

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Angiography

angiography

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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Transarterial Chemo-embolization (TACE)

TACE

What is transarterial chemoembolization (TACE)? Chemoembolization is a procedure that allows a dose of chemotherapy drugs to be administered directly to your tumor. This procedure allows for the chemo drugs to be given to the tumor and lessens the side effects associated with chemotherapy. TACE is most often used to treat liver tumors. How is TACE done? An anesthetic (numbing medicine) will be applied to your skin. Dr. Christenson will make a small incision in your groin then thread a catheter (small plastic tube) from your groin into the artery...

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MRI Services

MRI

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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