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Detection of severe acute pancreatitis by contrast-enhanced magnetic resonance imaging
A Piironen1, R Kivisaari, E Kemppainen
1Department of Radiology, Helsinki University Central Hospital, Haartmaninkatu 4, SF-00290 Helsinki, Finland.
Abstract:
The aim of the study was to assess the ability of MRI to differentiate between the two forms of severity of acute pancreatitis (AP), which is important for the detection of patients who require intensive monitoring and therapy. The second objective was to evaluate whether the distinction would be possible regardless of the MRI equipment. Magnetic resonance imaging was performed before and after intravenous administration of a gadolinium (Gd) chelate at 1.0 T using the breath-hold multislice rapid gradient-echo turbo fast low-angle shot (FLASH) sequence in 14 patients, and at 1.5 T with the 2D FLASH(50) sequence with fat saturation in 18 patients with acute pancreatitis early in the course of the disease. The patients were classified according to the Atlanta classification system as having the mild (MAP) or severe (SAP) form of the disease. At 1.0 T with use of a body coil, contrast-enhanced MRI failed to distinguish mild from severe pancreatitis. At 1.5 T with a phased-array body coil, the signal intensities of the patients with SAP were statistically significantly lower than those of the MAP group. Our initial clinical experience suggests that MRI with a sufficient magnetic field gradient strength may be useful for separating the two forms of acute pancreatitis in their early phases.
Insights
Magnetic resonance imaging (MRI) can differentiate mild from severe acute pancreatitis (AP) when using 1.5 T equipment. This distinction is crucial for identifying patients needing intensive monitoring and therapy early in the disease course.
Area of Science:
- Radiology
- Medical Imaging
- Gastroenterology
Background:
- Acute pancreatitis (AP) has two forms: mild (MAP) and severe (SAP).
- Differentiating between MAP and SAP is vital for appropriate patient management and therapy.
- Current diagnostic methods may not always accurately distinguish between AP severity early in the disease.
Purpose of the Study:
- To assess MRI's ability to differentiate between mild and severe acute pancreatitis.
- To determine if MRI can distinguish AP severity irrespective of equipment field strength.
- To identify early indicators of AP severity using advanced imaging techniques.
Main Methods:
- Contrast-enhanced MRI was performed on 32 patients with acute pancreatitis.
- Imaging was conducted at 1.0 T (n=14) and 1.5 T (n=18) using specific FLASH sequences.
- Patients were classified as having mild acute pancreatitis (MAP) or severe acute pancreatitis (SAP) based on the Atlanta classification.
Main Results:
- MRI at 1.0 T with a body coil could not differentiate between MAP and SAP.
- At 1.5 T with a phased-array body coil, signal intensities were significantly lower in SAP patients compared to MAP patients.
- Higher magnetic field gradient strength appears crucial for distinguishing AP severity.
Conclusions:
- MRI, particularly at 1.5 T with advanced coils, shows potential for differentiating early-stage mild from severe acute pancreatitis.
- This imaging capability can aid in timely identification of high-risk patients requiring intensive care.
- Further research with larger cohorts is warranted to validate these findings.