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Nuclear Medicine

If you’ve been diagnosed with cancer and need to know if it has spread; if you have tremors and Parkinson’s disease is suspected; or if an organ is at risk of damage due to an ongoing disease or condition, nuclear medicine is often the go-to tool for answers.

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Imaging Molecular Activity

Nuclear medicine is a remarkable branch of imaging that is used to investigate abnormal molecular activity in many areas of the body. Instead of producing pictures of tumors or fractures, nuclear medicine visualizes activity within your body at the molecular level.

A trace amount of radioactive material called a radiopharmaceutical is injected, swallowed or inhaled prior to the procedure, and the body area of concern is imaged using a camera that captures radioactive signals.  A computer then reconstructs the signals into pictures. Scanners include the basic gamma camera, single photon emission computed tomography (SPECT) or positron emission tomography (PET). Many different radiopharmaceuticals are used depending on the body area being examined. These are sometimes merged with anatomic images acquired at the same time.

Common uses of nuclear medicine include perfusion studies, which visualize how well blood is used by the heart, the lungs and the brain.

One example of a technique that can be used is myocardial perfusion imaging, often combined with an exercise stress test or a nuclear stress test, which reveals blocked arteries and areas of the heart muscle with inadequate blood supply. This test can indicate whether you need additional imaging, angioplasty and stent placement, or cardiac surgery.

Nuclear medicine also is used for many purposes, including finding hairline fractures and arthritis in the bones, treating abnormal thyroid, locating inflammation of the gallbladder and identifying the source of fevers and infections of unknown origin.

Young hispanic male doctor looking at scan on computer

Some of the most powerful uses of nuclear medicine are in oncology, both as a diagnostic and a therapeutic tool. Common tests include:

  • PET-CT — A hybrid technology that merges nuclear molecular imaging with the anatomical precision of CT. PET-CT has proven very useful in diagnosing suspected cancer and identifying cancer that has spread to different parts of the body. It works with FDG, a sugar tagged with fluorine-18 that concentrates in tumors due to the rapid metabolism associated with cancer and shows up as hot spots on the image. PET-CT can be used in nuclear cardiology. Other molecular targets can also be imaged to answer specific medical questions.
  • Therapeutic Nuclear Medicine — For many years, thyroid cancer has been treated with radioactive iodine (I-131) therapy, and now additional treatments are emerging. Radioimmunotherapy, pairing nuclear medicine with immunotherapy techniques delivers treatment directly to cancer cells.

Nuclear medicine can also be used for a wide range of other purposes including bone, kidney, liver, spleen, thyroid and lung scans, MUGA (cardiac blood pooling) scans and gastric emptying studies.

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Doctor Profiles

The following doctors are part of the Sutter Health network. Learn about the doctors on this site.
Max C. Wu, M.D.

Max C. Wu, M.D.

  • Nuclear Medicine

Jason B. Cohen, M.D.

Jason B. Cohen, M.D.

  • Nuclear Medicine

Thomas R. Pounds, Jr., M.D., FACNM

Thomas R. Pounds, Jr., M.D., FACNM

  • Nuclear Medicine

Nellis A. Smith, M.D.

Nellis A. Smith, M.D.

  • Nuclear Medicine

Puskar Pattanayak, M.D.

Puskar Pattanayak, M.D.

  • Nuclear Medicine

Amadeu F. Santos, M.D.

Amadeu F. Santos, M.D.

  • Nuclear Medicine

Elma Abella Columna, M.D.

Elma Abella Columna, M.D.

  • Nuclear Medicine

Jasmine C. Branchcomb, M.D.

Jasmine C. Branchcomb, M.D.

  • Nuclear Medicine

Shalini L. Bhambani, M.D.

Shalini L. Bhambani, M.D.

  • Nuclear Medicine

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