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


Kathleen Ryan, MD

Dr. Ryan is a board-certified radiologist, specializing in Breast Imaging.

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Neurologic Imaging

Neuroradiology is a subspecialty of radiology, focusing on the diagnosis and characterization of abnormalities of the central and peripheral nervous system, spine, and head and neck. Neurologic imaging methods include computed tomography (CT) and magnetic resonance imaging (MRI). Ultrasound is used in limited circumstances, in particular in the pediatric population. Angiography is traditionally used for diagnosis of vascular abnormalities or diagnosis and characterization of masses or other lesions but is being replaced in many instances by CT...

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Tumor Cryoablation

What is tumor cryoablation? Tumor cryoablation is a procedure that uses extreme cold to freeze and destroy cancer cells. Cryoablation is used to treat tumors of the kidney. How is tumor cyroablation done? A needle-like applicator will be placed in contact with the tumor, more than one applicator may be used depending on the tumor size and location. Dr. Christenson will use ultrasound and other x-ray imaging to guide the applicator(s) to the treatment site. Once the applicator is in the correct location, Dr. Christenson will administer argon gas...

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What does TIPS stand for? TIPS stands for transjular intrahepatic portosystemic shunt: Transjugular – through the jugular vein in your neck Intrahepatic – within your liver Portosystemic – from the portal vein to the hepatic vein Shunt – a tube that allows flow from one blood system to another What is a TIPS procedure? A transjugular intrahepatic portosystemic shunt (TIPS) is a procedure where a path is created in the liver to connect two veins, the path is called a shunt. The shunt is held open by a small tube called a stent (see picture...

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