Method and system for performing upright magnetic resonance imaging of various anatomical and physiological conditions
Vasculature or parenchyma is imaged using upright MRI techniques, on patients who may have conditions such as congestive heart failure, or otherwise be healthy. When an individual is horizontal, venous drainage is minimized, causing the vessels to remain engorged, also referred to herein as vascular congestion. Vascular congestion results in an enlarging of the vessels and surrounding tissue causing the vessels to be more visible on MRIs. The decrease in vascular visibility in upright subjects is in part, due to an increase in venous drainage. Patients suffering from coronary and/or pulmonary deficiencies (e.g. CHF) experience decreased rates and degrees of venous drainage. In one embodiment, the present invention uses upright imaging to visualize these enlarged vessels.
1. A method for providing information determinative of an amount and presence of vascular congestion in a patient using magnetic resonance signals, comprising the steps of:
placing the patient into a magnetic resonance imaging apparatus capable of obtaining images in an upright, Trendelenburg, prone and supine postural positions;
obtaining magnetic resonance signals of vasculature of the patient's organ without using hyperpolarized gas;
processing the magnetic resonance signals to obtain magnetic resonance image data;
processing the image data to determine one or more measures of anterior/posterior signal gradation, superior/inferior signal degradation and mean signal-to-noise; and
determining the postural dependence of the presence and amount of vascular congestion based on the one or more of the determined measures of anterior/posterior signal gradation, superior/inferior signal degradation and mean signal-to-noise.
2. The method of claim 1 , wherein obtaining further comprises obtaining magnetic resonance signals of the patient's lung vasculature.
3. The method of claim 1 , wherein obtaining further comprises obtaining magnetic resonance signals of the patient's kidney vasculature tissue.
4. The method of claim 1 , wherein obtaining further comprises obtaining magnetic resonance signals of the patient's liver vasculature.
5. The method of claim 1 , wherein obtaining comprises obtaining magnetic resonance signals of the patient's vasculature.
6. The method of claim 1 , wherein processing includes obtaining a magnetic resonance image while the patient is in the upright position that conveys information about the presence or absence of congestive heart failure.
7. The method of claim 1 , wherein processing includes obtaining a magnetic resonance image while the patient is in the upright position that conveys information about the presence or absence of congestive heart failure.
8. The method of claim 1 , wherein using intensity information comprises dividing an average magnetic resonance signal intensity in a region of interest by a standard deviation of magnetic resonance signal intensity in a region of air outside the patient.
9. A method for providing imaging information determinative of a presence or absence of fluid in the parenchyma in a patient based on magnetic resonance signals, comprising the steps of:
positioning the patient into a magnetic resonance imaging apparatus capable of obtaining images in an upright, Trendelenburg, prone and supine postural positions;
obtaining magnetic resonance signals of the parenchyma of a selected organ or organs without using hyperpolarized gas;
processing the magnetic resonance signals to obtain a magnetic resonance image data;
processing the image data to determine one or more measures of anterior/posterior signal gradation, superior/inferior signal degradation and mean signal-to-noise; and
determining the postural dependence of the presence or absence of fluid in the parenchyma based on one or more of the determined measures of anterior/posterior signal gradation, superior/inferior signal degradation and mean signal-to-noise.
10. The method of claim 9 , wherein obtaining comprises obtaining magnetic resonance signals of kidney parenchyma.
11. The method of claim 9 , wherein obtaining comprises obtaining magnetic resonance signals of liver parenchyma.
12. The method of claim 9 , wherein processing further includes obtaining a magnetic resonance image while the patient is in the upright position that conveys information about the presence or absence of congestive heart failure.
13. The method of claim 9 , wherein using intensity information comprises dividing an average magnetic resonance signal intensity in a region of interest by a standard deviation of magnetic resonance signal intensity in a region of air outside the patient.