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DOI:10.2214/AJR.07.3182
AJR 2008; 190:1076-1084
© American Roentgen Ray Society

Pictorial Essay

Body MRI Using IDEAL

Daniel N. Costa1,2, Ivan Pedrosa1, Charles McKenzie1,3, Scott B. Reeder4 and Neil M. Rofsky1

1 Department of Radiology, Beth Israel Deaconess Medical Center, Boston, MA.
2 Present address: Departmento de Radiologia, Hospital Sirio-Libanês, Rua Dona Adma Jafet, 91, São Paulo – SP, Brazil 01308-050.
3 Present address: Department of Medical Biophysics, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada.
4 Department of Radiology, University of Wisconsin, Madison, WI.

OBJECTIVE. The intrinsic differences of water and fat protons in the MR environment allow selective interrogation of their contribution to the MR signal. Fat-suppression techniques and chemical shift imaging are routinely used in clinical body MRI. Iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) is a novel imaging technique for separating fat and water.

CONCLUSION. This article describes the basic principles of IDEAL MRI and illustrates the use of IDEAL imaging as an alternative to fat-suppression techniques and chemical shift imaging for body MRI.

Keywords: body imaging • chemical shift • fat suppression • iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) • MRI


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