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For other uses, see Phantom.
An imaging phantom for determining CT performance

Imaging phantom, or simply phantom, is a specially designed object that is scanned or imaged in the field of medical imaging to evaluate, analyze, and tune the performance of various imaging devices. A phantom is more readily available and provides more consistent results than the use of a living subject or cadaver, and likewise avoids subjecting a living subject to direct risk. Phantoms were originally employed for use in 2D x-ray based imaging techniques such as radiography or fluoroscopy, though more recently phantoms with desired imaging characteristics have been developed for 3D techniques such as MRI, CT, Ultrasound, PET, and other imaging methods or modalities.


A phantom used to evaluate an imaging device should respond in a similar manner to how human tissues and organs would act in that specific imaging modality. For instance, phantoms made for 2D radiography may hold various quantities of x-ray contrast agents with similar x-ray absorbing properties to normal tissue to tune the contrast of the imaging device or modulate the patients exposure to radiation. In such a case, the radiography phantom would not necessarily need to have similar textures and mechanical properties since these are not relevant in x-ray imaging modalities. However, in the case of ultrasonography, a phantom with similar rheological and ultrasound scattering properties to real tissue would be essential, but x-ray absorbing properties would not be needed.[1]

See also[edit]


  1. ^ Iturralde, Mario P. (1990), CRC dictionary and handbook of nuclear medicine and clinical imaging, Boca Raton, Fla.: CRC Press, p. 564, ISBN 0-8493-3233-8 

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3 news items

Medical Physics Web (subscription)
Mon, 09 Dec 2013 02:30:00 -0800

The researchers also simulated a human imaging phantom, comprising a 30 cm diameter tissue cylinder containing a 2 cm cylinder filled with gold solution. Gold was chosen because iodine fluorescence is strongly attenuated in larger objects, and gold Kα ...

International Business Times, India Edition

International Business Times, India Edition
Sat, 08 Mar 2014 02:57:21 -0800

Medical imaging often utilizes imaging phantom. For example, in order to confirm if the MRI machine or a CT scanner is functioning effectively, it needs to image a known dimension object and its material properties. "In health care, a 3D heart or ...
Fri, 06 May 2011 11:20:06 -0700

In the study, the researchers measured the doses by placing thermoluminescent dosimeters on the front and back of a Fluke Biomedical-made imaging phantom. First, the dummy got a baseline chest CT with tube current modulation from a 128-slice Siemens ...

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