Nuclear Medicine – Diagnosis and Therapy with Radiopharmaceuticals
Nuclear medicine is a medical specialty that uses radioactive substances to diagnose and treat diseases, providing unique insights into organ function and metabolism.
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Nuclear medicine is a medical specialty that uses radioactive substances to diagnose and treat diseases, providing unique insights into organ function and metabolism.
What is Nuclear Medicine?
Nuclear medicine is a medical specialty that uses radioactive substances called radiopharmaceuticals to diagnose and treat a wide range of diseases. Unlike conventional imaging methods such as X-ray or MRI, nuclear medicine focuses on the function and metabolic activity of organs and tissues rather than just their structure. This makes it possible to detect diseases at a very early stage, often before any anatomical changes are visible.
How Does Nuclear Medicine Work?
Radiopharmaceuticals consist of two components: a carrier molecule that targets specific tissues or organs, and a radioactive isotope that emits radiation. This radiation is detected by specialized cameras – such as the gamma camera, SPECT (Single Photon Emission Computed Tomography), or PET (Positron Emission Tomography) – and converted into detailed cross-sectional images.
The patient typically receives the radiopharmaceutical via intravenous injection. The substance then accumulates in the target tissue, and the emitted radiation is recorded by the camera. The radiation dose involved is comparable to that of other standard diagnostic X-ray examinations and is considered medically acceptable.
Diagnostic Applications
Nuclear medicine is used for a wide range of diagnostic examinations, including:
- Bone scintigraphy: Detection of bone metastases, fractures, and inflammation
- Cardiac scintigraphy (myocardial perfusion imaging): Assessment of blood flow to the heart muscle
- Thyroid scintigraphy: Diagnosis of thyroid nodules, hyperthyroidism, and hypothyroidism
- PET/CT: Early detection and staging of cancer, and evaluation of treatment response
- Lung scintigraphy: Detection of pulmonary embolism
- Renal scintigraphy: Assessment of kidney function and urinary drainage
Therapeutic Applications
In addition to diagnostics, nuclear medicine plays an important role in treating certain diseases. The damaging effect of radioactive radiation is used in a targeted manner to treat diseased tissue:
- Radioiodine therapy: Treatment of thyroid diseases such as Graves disease or differentiated thyroid carcinoma using radioactive iodine (iodine-131)
- PSMA radioligand therapy: Treatment of metastatic prostate cancer using radioactively labelled ligands
- DOTATATE therapy (PRRT): Treatment of neuroendocrine tumours
- Radiosynoviorthesis: Treatment of inflammatory joint diseases via local injection of radioactive substances
Key Devices and Techniques
Gamma Camera
The gamma camera is the classic device of nuclear medicine. It detects the gamma radiation emitted by radiopharmaceuticals and produces two-dimensional functional images of organs.
SPECT (Single Photon Emission Computed Tomography)
SPECT is an advanced form of gamma camera imaging that provides three-dimensional cross-sectional images. When combined with CT (SPECT/CT), functional and structural information can be overlaid for more precise interpretation.
PET (Positron Emission Tomography)
PET uses short-lived positron emitters such as fluorine-18 (e.g. in the form of FDG – fluorodeoxyglucose) and provides high-resolution cross-sectional images of metabolic activity. In combination with CT or MRI (PET/CT, PET/MRI), it is a central tool in oncology, neurology, and cardiology.
Safety and Radiation Protection
The amounts of radioactivity used in nuclear medicine are carefully calculated and medically justified. The radiopharmaceuticals used have short half-lives and are rapidly metabolised or excreted by the body. Nevertheless, strict radiation protection regulations apply to protect patients, staff, and the environment. For certain examinations and therapies, patients may be temporarily hospitalised to minimise radiation exposure to others.
References
- International Atomic Energy Agency (IAEA): Nuclear Medicine Physics – A Handbook for Teachers and Students. IAEA, Vienna, 2014. www.iaea.org
- Warwick J., Herholz K. et al. – Nuclear Medicine in Clinical Diagnosis and Treatment. Churchill Livingstone, 3rd Edition, 2004.
- World Health Organization (WHO): Radiation Protection and Safety in Medical Uses of Ionizing Radiation. WHO, 2021. www.who.int
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