An in vitro study of contrast agent optimization for MR hysterosalpingography

Area of Science:

• Radiology
• Medical Imaging
• Contrast Agents

Background:

• Gadolinium-iodine mixed contrast agents enhance fallopian tube visualization in MR-HSG.
• Standardization of mixing ratios for these agents is lacking.

Purpose of the Study:

• To determine the optimal mixing ratio of gadolinium-iodine contrast agents for MR-HSG.
• To evaluate contrast agent performance at different magnetic field strengths (1.5T and 3.0T).

Main Methods:

• In vitro study formulating 16 mixing ratios of gadolinium with saline (Gd-NS), iopromide (Gd-I370), and iodixanol (Gd-I320).
• Scans performed at 1.5T and 3.0T using T1 contrast enhancement sequences.
• Qualitative grading of image quality and quantitative comparison of signal intensity (SI) variations.

Main Results:

• Gd-I370 and Gd-I320 showed highest SI and good image quality at 1:300 ratio (1.5T) and 1:200 ratio (3.0T).
• No significant SI difference between Gd-I370 and Gd-I320 at either field strength.
• Contrast agent SI was significantly higher at 3.0T compared to 1.5T.

Conclusions:

• A 1:300 gadolinium-iodine ratio is optimal for 1.5T MR-HSG.
• A 1:200 gadolinium-iodine ratio is optimal for 3.0T MR-HSG.
• Higher signal intensity is achieved with 3.0T MR-HSG.