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[Contrast-enhanced subtraction MRT in the spin-echo technic]
1Zentrales Institut für Radiologie, LKH Feldkirch, Osterreich.
Purpose:
The aim of the retrospective study was to determine whether subtraction of spin-echo images is useful for estimating intensity and extension of contrast enhancement when practised in daily routine diagnostic work.
Methods:
348 patients with different diseases of the musculoskeletal and neuro system were examined with MRI using a T1-weighted spin-echo sequence before and after application of 0.1 mmol/kg Gd-DTPA with subsequent subtraction of both measurements. Usefulness of the source images, pictorial quality of subtracted images and intensity of contrast enhancement were assessed subjectively.
Results:
Subtracted images were of sufficient quality in 85% of the cases, whereas source images were always usable except in 9 patients. It was easier to visualise the extent of contrast enhancement in subtracted than in non-subtracted images in examinations of the musculoskeletal system, whereas there was no difference in the neuro system. Contrast enhancement could definitely be excluded in 15% of the patients and was stated to be of low, medium and high intensity in 21%, 45% and 19%, respectively. In comparison with subtracted images lesions were stated to appear larger in 62% and 87%, smaller in 25% and 13%, and of the same size in 13% and 0% for T2-weighted and fat-suppressed images, respectively.
Conclusion:
Subtraction of spin-echo images before and after application of contrast media is useful for estimating intensity and extension of contrast enhancement without essentially increasing time and costs of the examination. Extension of contrast enhancement in musculoskeletal lesions rarely correlates with the extension of signal changes in T2-weighted and fat-suppressed images.
Insights
Subtracting MRI spin-echo images before and after contrast media (Gd-DTPA) aids in assessing enhancement intensity and extent, particularly for musculoskeletal conditions, without significant time or cost increases.
Area of Science:
- Radiology
- Medical Imaging
- Diagnostic Techniques
Background:
- Magnetic Resonance Imaging (MRI) is crucial for diagnosing various conditions.
- Contrast enhancement assessment is vital for accurate diagnosis.
- Routine MRI protocols often involve pre- and post-contrast imaging.
Purpose of the Study:
- To evaluate the utility of subtracting pre- and post-contrast T1-weighted spin-echo MRI images.
- To determine if image subtraction improves the estimation of contrast enhancement intensity and extension.
- To assess the practicality of this technique in daily diagnostic workflows.
Main Methods:
- Retrospective analysis of 348 patient MRI examinations.
- T1-weighted spin-echo sequences acquired before and after Gd-DTPA administration (0.1 mmol/kg).
- Subjective assessment of source image quality, subtracted image quality, and contrast enhancement.
Main Results:
- Subtracted images were of sufficient quality in 85% of cases.
- Enhanced visualization of contrast enhancement extent in musculoskeletal system with subtraction.
- Contrast enhancement intensity categorized as low (21%), medium (45%), and high (19%).
Conclusions:
- Subtraction of spin-echo MRI images is a valuable tool for evaluating contrast enhancement.
- The technique is efficient, adding minimal time and cost to routine MRI examinations.
- Correlation between contrast enhancement and T2-weighted/fat-suppressed signal changes in musculoskeletal lesions is limited.