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Diagnostic Imaging Services


Your diagnosis is conducted by expert technicians and doctors using advanced equipment. These experts will supervise and interpret your examinations and will submit a signed report to your primary care or referring doctor in an efficient manner after each test.


Our Diagnostic Imaging staff operates advanced digital equipment in six areas:

  • Computerized Tomography (CT)
  • Magnetic Resonance Imaging (MRI)
  • Mammography
  • Nuclear Medicine
  • Radiology (X-ray)
  • Ultrasound

CT Scans

Computerized Tomography (CT) at Mark Twain Medical Center uses the General Electric Optima CT660 128-slice technology. The CT660 is used by major hospitals for its speed and image clarity.


PET/CT scanner is an acronym for Positron Emission Tomography and Computed Axial Tomography, commonly called PET/CT. Our scans are often used to see how effective an ongoing treatment is. PET scans are commonly used to investigate cancer, epilepsy, Alzheimer’s disease, and heart disease.

Magnetic Resonance Imaging

Magnetic Resonance Imaging (MRI) allows our doctors to see inside the human body in remarkable detail without using x-rays. MRI images are produced with the use of a powerful magnetic field, radio waves, and a sophisticated computer system. 


Our Digital Mammography system was installed in 2010. Breast biopsies as well as stereotactic biopsies are performed at the hospital.


Ultrasound is used for evaluating the abdomen, pelvis, breast, blood vessels, and fetal growth. It is also used for guiding biopsies and performing echo cardiography (studies of the heart) and studies of the extremities.

Nuclear Medicine

Nuclear Medicine performs a full array of studies. The most common nuclear medicine study helps diagnose Coronary Artery Disease (CAD), or blockages in the arteries that supply blood to your heart muscle. 


Radiology covers fluoroscopy and general x-ray. Radiology at the hospital is active with scheduled outpatient visits and surgeries, plus the demanding requirements of the Emergency Department. We also offer radiology services in Arnold and Angels Camp. 

Learn More About Our Diagnostic Imaging

For more information, or to make an appointment, please call us at 209.754.2594.   

Use Our Find A Doctor Service

To find a doctor affiliated with Mark Twain Medical Center, please call 209.754.2602 or use our online Find a Doctor tool, which is available 24 hours a day, seven days a week. 




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 Mark Twain Medical Center    
 768 Mountain Ranch Rd.
 San Andreas CA 95249
 (209) 754-3521
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