Magnetic resonance imaging method of magnetization transfer and level choose inversion recovery combined pre-pulse

Abstract

The invention discloses a magnetic resonance imaging method of magnetization transfer and level choose inversion recovery combined pre-pulse. The method comprises the following steps: I, transmitting an excitation signal: transmitting the excitation signal to a detected object; when the excitation signal is transmitted, applying a magnetization transfer pulse sequence, a level choose inversion recovery pre-pulse sequence and a frequency choose pre-saturation method fat suppression pulse sequence according to the magnetization transfer and level choose inversion recovery combined mode; II, sampling the signal: sampling the magnetic resonance data of the detected object by using magnetic resonance imaging equipment, wherein the sampled magnetic resonance data is an echo signal of the transmitted excitation signal; III, imaging: acquiring vascular image data according to the sampled magnetic resonance data. The method has the advantages of simple steps, rational design, convenience in implementation and good use effect; on the premise that no contrast agent is used for enhancement, high-quality vascular imaging can be obtained and the imaging time is short; the method is a true noninvasive vascular imaging method without using the contrast agent.

Description

technical field [0001] The invention relates to a magnetic resonance imaging method, in particular to a magnetic resonance imaging method using magnetization transfer combined with layer selective inversion recovery pre-pulse. Background technique [0002] Blood vessels are the conduits for biological transport of blood, and are an important physiological and anatomical basis for maintaining metabolism in the human body. As we all know, various diseases will lead to morphological changes of blood vessels, and pathological changes of blood vessels can also cause corresponding target organ involvement. Therefore, blood vessels are closely related to the occurrence, development and outcome of various diseases and are mutually causal. How to evaluate and display the physiological and pathological changes of blood vessels in vivo is very important for in-depth investigation of the cause, development, prognosis assessment and treatment plan decision-making of diseases, and has alw...

AI Technical Summary

Problems solved by technology

However, this technology still has many difficulties in MRA of body vessels, which are mainly reflected in the following aspects: ①body vessels run in multiple directions, and small vessels are tortuous, while TOF method is sensitive to the direction of blood flow and is prone to saturation ② The inspection time is too long. For body vascular imaging, in order to avoid breathing and heartbeat artifacts, ensure that the signal acquisition site is at the same position each time, use ECG triggering and breathing triggering or breath-holding if necessary technology; for patients with poor respiratory function or children (cannot hold breath or irregular breathing), it is necessary to increase the acquisition, which will prolong the acquisition signal time; in addition, due to the large imaging range of the body, the acquisition time will also be increased; and Excessive time (10 minutes to 20 minutes) acquisition is intolerable to the subject, and the result is poor imaging effect; ③Tissue with short T

Images