METHOD FOR DETECTING COLORECTAL ANASTOMOSIS FAILURE USING MAGNETIC RESONANCE IMAGING Russian patent published in 2023 - IPC A61B6/00 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to radiation diagnostics, and can be used to detect failure of the colorectal anastomosis using magnetic resonance imaging (MRI). MRI is performed with T2 weighted images (WI) with high spatial resolution in three orthogonal planes at the level of the anastomosis, a series of T1-WI with fat suppression in the FastFieldEcho pulse sequence in three orthogonal planes is obtained. On the sagittal image, the distance from the anal edge to the anastomosis is measured along the center of the intestinal lumen. A mark is applied to the catheter at a distance equal to the measured distance from the anal edge to the anastomosis minus 1 cm, and the depth of enema injection is marked with a marker. Then, on the MRI table, a contrast agent is injected into the rectum aimingly into the anastomosis zone using a Nelaton urological catheter with a diameter of 14 to 16 mm attached to the syringe in a volume of 20-50 ml at the rate of 0.1 ml of one-molar gadolinium contrast agent per 10 ml of saline or 0.2 ml of semi-molar gadolinium contrast agent per 10 ml of saline. After a contrast enema, a second series of T1-WI with fat suppression in a FastFieldEcho pulse sequence is obtained - a fast field echo in three orthogonal planes. If the images determine the exit of the contrast beyond the intestinal wall, then the failure is considered confirmed. If there is no leakage of contrast from the intestinal wall on the images, then the failure is considered unconfirmed.

EFFECT: method provides effective and safe detection of defects in large intestine anastomoses due to a smaller volume of injected contrast and taking into account the localization of the anastomosis.

1 cl, 6 dwg, 1 tbl, 2 ex