Case of the month - June
Thyroid Volumetry using freehand 3D ultrasound (tomographic Ultrasound): exemplary comparison with 2D model and MRI
Markus Krönke, Resident Physician, Nuclear Medicine, Klinikums rechts der Isar, Technische Universität München, Munich, Germany
Dr. Thomas Wendler, Senior Scientist, Computer Aided Medical Procedures and Augmented Reality, Technische Universität München, Munich, Germany
Thyroid volumetry plays an essential role in the calculation of the applied dose of radioiodine in patients with Morbus Basedow and local autonomies. Currently, three ultrasound (US) measurements taken by hand in two different planes are used to calculate volume using different mathematical models. Literature shows that these measurements do not only show high intra-observer and inter-observer variation, but may also underestimate the overall volume of the thyroid by up to 30%. Tomographic ultrasound (tUS) might be a user-independent alternative that yields smaller errors. In order to validate this, we compared tUS volumetry with the conventional 2D US approach and calculations based on magnetic resonance images (MRI) as the gold standard.