Cardiac MRI

【心臓画像クリニック飯田橋-CVIC-】心臓MRI検査・心臓ドック・画像診断のスペシャリストチーム | 東京都新宿区

MRI is a method of drawing the state of hydrogen nuclei in water and fat in the body using magnets and radio waves. MRI requires a tubular device that is equipped with a magnet that is tens of thousands of times stronger than the Earth's magnetism and creates a uniform magnetic field (A in the figure). Creating this uniform magnetic field requires a very high level of skill, which is why MRI equipment is expensive. In addition, in order to receive the radio wave signal generated from the body, a receiving coil corresponding to each body part is required. In the case of the heart, it is the receiving coil dedicated to the heart (B). I put my body in a magnet tube with a uniform magnetic field, irradiate the radio waves in a short time, and receive the radio waves coming out of my body when the radio waves are stopped to create an image ( C). A closer look reveals an image of the "spin" of hydrogen nuclei inside the body (D).

 

First, the hydrogen nuclei are well aligned in a certain direction in a strong magnetic field. Next, it irradiates a weak radio wave in the frequency band of the radio, and causes the hydrogen nucleus contained in a certain cross section of the body to absorb the energy of the radio wave. When the radio wave irradiation is stopped, the absorbed energy is released and returned to its original state, and the radio wave signal obtained at that time is imaged by a computer. In MRI, the vibration noise of the machine is generated every time the radio wave is applied, which may be quite noisy. This is the cause of the loud noise you hear on an MRI scan.

In addition, cardiac MRI can visualize the coronary arteries without radiation exposure and without the use of contrast media. At the same time, it is possible to evaluate the pump function (cardiac function) of the heart, and the evaluation of cardiac function by cardiac MRI is considered to be the most reliable and has been adopted in clinical studies on various cardiac functions. In addition, contrast-enhanced cardiac MRI examinations using contrast media have the high potential of being able to obtain all the information obtained separately from conventional cardiac imaging such as echocardiography, myocardial scintillation, and coronary angiography in about one hour. I'm waiting. Therefore, it is called a "one-stop shop" overseas.

1. Cardiac MRI

Cardiac MRI full study examination recommended by the Cardiac MRI Society.  Myocardial scintillation is useful for accurate diagnosis in areas where reduced sensitivity is a problem.

【心臓画像クリニック飯田橋-CVIC-】心臓MRI検査・心臓ドック・画像診断のスペシャリストチーム | 東京都新宿区

3. Delayed contrast MRI examination

Using a gadolinium contrast medium for MRI, it is possible to observe the state of the heart muscle, which is the muscle of the heart, in detail. It is also used as an indicator of myocardial viability.

  

【心臓画像クリニック飯田橋-CVIC-】心臓MRI検査・心臓ドック・画像診断のスペシャリストチーム | 東京都新宿区

2. Coronary MRA examination

With coronary MRA, it is possible to make the blood glow white and clearly depict the coronary arteries without using a contrast medium. Japan can be said to be one of the countries where coronary MRA technology is advanced in the world.  

【心臓画像クリニック飯田橋-CVIC-】心臓MRI検査・心臓ドック・画像診断のスペシャリストチーム | 東京都新宿区

4. Loaded myocardial blood flow MRI examination

It is a method of increasing myocardial blood flow using a drug that increases myocardial blood flow, and examining by MRI whether a sufficient increase in blood flow can be obtained at that time.

  

【心臓画像クリニック飯田橋-CVIC-】心臓MRI検査・心臓ドック・画像診断のスペシャリストチーム | 東京都新宿区
【心臓画像クリニック飯田橋-CVIC-】心臓MRI検査・心臓ドック・画像診断のスペシャリストチーム | 東京都新宿区