Susan Ghods, Presenter: Nothing to Disclose

Kambiz Parchamazad , Abstract Co-Author: Nothing to Disclose

Sayed Hashemi, Abstract Co-Author: Nothing to Disclose

Robert Wilensky MD, Abstract Co-Author: Nothing to Disclose

Harold Ira Litt MD, PhD, Abstract Co-Author: Nothing to Disclose

Delayed enhancement MR imaging can be used to measure infarct size in patients with acute and chronic myocardial infarction using an inversion recovery gradient echo sequence. Using normal magnitude reconstruction techniques, the inversion recovery time (TI) must be set precisely to null the signal of normal myocardium. Phase sensitive reconstruction imaging (PSIR) avoids the need for precise setting of the TI, maintaining excellent contrast between normal and infarcted myocardial tissue over a wide range of TI values. Using a single-shot PSIR sequence, an image is acquired during every two heartbeats, so that short axis imaging through the entire LV can be performed rapidly without the need for additional imaging to determine the optimal TI. The purpose of this study was to compare single-shot PSIR and traditional segmented k-space IR-FLASH techniques for measurement of acute myocardial infarct size.

IR-Flash images could not be evaluated in 2/33 cases, and the PSIR images could not be evaluated in 4/33 cases (neither series could be evaluated in 1 case). There was no significant difference in measured infarct size between the IR-FLASH and PSIR techniques. Infarct sizes were 16.31±4.97 cm2 and 16.53±5.45 cm2, respectively. Mean difference in infarct size (IR-FLASH – PSIR) was 0.39±2.39 cm2. (p=0.39)

Delayed enhancement imaging using the single-shot PSIR technique provides rapid and accurate assessment of infarct size in setting of acute MI without the need for additional imaging to determine optimal inversion time.

H.I.L.: Author receives research support from Siemens Medical Solutions for unrelated projectsS.H.,R.W.: No Disclosure.

Ghods, S, Parchamazad , K, Hashemi, S, Wilensky, R, Litt, H, Rapid Imaging of Delayed Enhancement in Acute Myocardial Infarction Using a Single-shot Phase Sensitive Inversion Recovery Technique.  Radiological Society of North America 2005 Scientific Assembly and Annual Meeting, November 27 - December 2, 2005 ,Chicago IL. http://archive.rsna.org/2005/4415324.html