Automatic liquid level control device and method for hyperpolarized gas collection

Abstract

The invention discloses an automatic liquid level control device for hyperpolarized gas collection. The device comprises a Dewar tank, a range finder, a pressure sensor, an auxiliary heater, an electromagnetic valve, an exhaust port, a connecting pipe, a Dewar, a console and a valve. The invention further discloses an automatic liquid level control method for hyperpolarized gas collection, the structure is simple, operation is easy, automatic lifting of the liquid level of the low-temperature cooling liquid in the hyperpolarized gas collection process can be achieved, and blockage and polarization loss of the hyperpolarized gas in the collection process are avoided.

Description

technical field [0001] The present invention relates to the technical field of lung hyperpolarized gas magnetic resonance imaging, in particular to an automatic liquid level control device for hyperpolarized gas collection, and also to an automatic liquid level control method for hyperpolarized gas collection . Background technique [0002] According to statistics, the number of deaths due to lung diseases accounts for more than 20% of the total number of deaths in my country every year. At present, commonly used clinical imaging techniques, such as computed tomography (CT), single photon emission tomography (SPECT), positron emission computed tomography (PET) and other technologies, have radioactive or ionizing radiation hazards, and can not affect the exchange of lungs. function is evaluated. Magnetic resonance imaging (MRI) can image the structure and function of almost all tissues and organs in the human body without ionizing radiation or radioactivity, and has been wi...

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Problems solved by technology

[0005] At present, the methods used to control the cooling liquid mainly include the following: 1) Manual addition, that is, adding a certain amount of cooling liquid at intervals, this method has poor repeatability, mainly depends on experience, wastes manpower and has extremely poor accuracy; 2) Stepping The motor control is equipped with a cooling liquid Dewar lift, this method can realize the control of the liquid level to a certain extent, but the fluctuation of the ambient temperature in this way will greatly affect the evaporation speed of the cooling liquid, and at the same time, hyperpolarization occurs when different gas flow rates The evaporation rate caused by the heat brought in by the gas mixture is also very different, so the liquid level cannot be accurately controlled, and the use is more cumbersome; 3) The liquid level control is realized by setting some special Dewar devices, such as a kind for The liquid nitrogen liquid level control and display device collected by hyperpolarized xenon (patent application number: 201510274966.9) realizes the control and display of the liquid nitrogen liquid level by combining special-shaped Dewar bottles with liquid nitrogen tanks and buoyancy-controlled hollow spheres

However, this method can only keep the liquid level constant, and is not suitable for the current spiral gas collector, which needs the liquid level to rise slowly to collect hyperpolarized gas; at the same time, it needs to add liquid nitrogen to maintain the liquid level, resulting in cooling liquid (liquid nitrogen) ) is a huge waste of

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