ASHLAND, Ky. (AP) — Attorneys for a doctor accused of performing unnecessary heart procedures say the charges should be dismissed.

A media outlet reported Dr. Richard Paulus is accused of performing unnecessary procedures on hundreds of patients from 2008 until he retired in 2013. The indictment also said the Ashland cardiologist billed Medicare for more heart catheterization and stent procedures than any other cardiologist in Kentucky.

Paulus has pleaded not guilty to charges of health care fraud and making false statements.

In court documents arguing for dismissal of the charges, Paulus’ attorneys say the angiograms that government prosecutors are relying on for their case are difficult to read and subject to differing interpretations. They also say the angiograms prosecutors have are not the originals but degraded versions retained for hospital records.