Systems and methods of determining injection protocols for diagnostic imaging procedures

Patent metadata

Field	Value
Publication number	US-9616166-B2
Application number	US-201213654680-A
Country	US
Kind code	B2
Filing date	Oct 18, 2012
Priority date	Nov 16, 2004
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A method and system for tailoring an injection protocol to an individual patient, wherein the injection protocol is administered in connection with a diagnostic imaging procedure. The method includes: administering a test injection of a fluid including a contrast enhancing fluid into the patient at an administration site; performing a test scan of one or more regions of interest of the patient as the fluid propagates through the patient to obtain scan data; determining from the scan data an enhancement output from each of the one or more regions of interest at a plurality of points in time as a result of the propagation of the fluid through the patient; and determining the injection protocol for the patient based at least in part upon the enhancement output from each of the one or more regions of interest at each of the plurality of points in time.

First claim

What is claimed is:

1. A method of tailoring an injection protocol to an individual patient, the injection protocol to be administered in connection with a diagnostic imaging procedure, the method comprising:
(a) administering a test injection of a fluid into the individual patient at an administration site thereof, the fluid including a contrast enhancing fluid;
(b) performing a test scan of one or more regions of interest of the individual patient as the fluid propagates therethrough to obtain scan data resulting therefrom;
(c) determining from the scan data an enhancement output from each of the one or more regions of interest at a plurality of points in time as a result of the propagation of the fluid therethrough; and
(d) determining the injection protocol for the individual patient based at least in part upon the enhancement output from each of the one or more regions of interest at each of the plurality of points in time.

2. The method of claim 1 wherein, in step (d), the injection protocol is determined at least in part by determining at least one difference between the enhancement output from a first of the one or more regions of interest with the enhancement output from a second of the one or more regions of interest so as to provide a measure of at least one physiological parameter of the individual patient.

3. The method of claim 2 wherein the at least one physiological parameter includes a volumetric blood flow calculated from:

Q
CO

=

M
I

∫
0
∞

⁢

c
⁡

(
t
)

⁢

ⅆ
t

where M 1 is a total mass of the fluid injected to the patient, c(t) is the measure of a concentration of the contrast enhancing fluid therein and Q co is a cardiac output that is representative of the blood flow.

4. The method of claim 2 wherein the at least one physiological parameter includes a blood volume calculated from:

PeakEnh
⁡

[

H
⁢

⁢
U

]

=

Mass
I

⁡

[
mg
]

BloodVolume
⁡

[
ml
]

where Mass 1 is a mass of iodine injected into the patient, PeakEnh is a peak value of intensity in the one or more regions of interest and BloodVolume is the blood volume from the administration site to the one or more regions of interest.

5. The method of claim 2 wherein the step of determining the injection protocol further includes:
(a) identifying a patient transfer function for the individual patient based on data specific to the individual patient, the patient transfer function enabling prediction of a desired level of enhancement to be output from each of the two or more regions of interest based on a given input; and
(b) updating the patient transfer function using at least one of (i) the measure of the at least one physiological parameter of the individual patient and (ii) some of the scan data acquired as a result of the test scan; and
(c) determining through a numerical optimization technique the given input that, when entered into the patient transfer function, determines the injection protocol for the individual patient with which to generate the desired level of enhancement for each of the two or more regions of interest.

6. The method of claim 5 wherein the data specific to the individual patient includes at least one of a height thereof, a weight thereof, a heart rate thereof, a blood pressure thereof and a cardiac output thereof.

7. The method of claim 5 wherein the data specific to the individual patient is obtained from at least one of a human operator, a hospital information system, an imaging device, an injection system and a monitoring device.

8. The method of claim 2 wherein the at least one physiological parameter is a parameter of the cardiopulmonary system.

9. The method of claim 8 wherein the at least one physiological parameter is at least one of (i) a volume of blood in at least a portion of the cardiopulmonary system, (ii) a rate at which blood is output from at least a portion of the cardiopulmonary system, (iii) a rate at which blood diffuses through at least a portion of the cardiopulmonary system, and (iv) a delay in transit of blood through at least a portion of the cardiopulmonary system.

10. The method of claim 2 wherein the first of the one or more regions of interest comprises at least a portion of an aorta of the individual patient and the second of the one or more regions of interest comprises at least a portion of a pulmonary artery of the individual patient.

11. The method of claim 2 wherein the first of the one or more regions of interest comprises at least vessels and structure of a right side of a heart of the individual patient and the second of the one or more regions of interest comprises at least vessels and structure of a left side of the heart.

12. The method of claim 5 wherein the patient transfer function is a mathematical model of the propagation of the fluid between the administration site of the fluid and the one or more regions of interest to be enhanced thereby as a result of the injection protocol to be administered in connection with the diagnostic imaging procedure.

13. A method of tailoring an injection protocol to an individual patient, the injection protocol to be administered in connection with a diagnostic imaging procedure, the method comprising:
(a) identifying a patient transfer function for the individual patient based on data specific to the individual patient, the patient transfer function enabling prediction of a desired level of enhancement to be output from each of two or more regions of interest based on a given input;
(b) administering a test injection of a fluid into the individual patient at an administration site thereof, the fluid including a contrast enhancing fluid;
(c) performing a test scan of the two or more regions of interest of the individual patient as the fluid propagates therethrough to obtain scan data resulting therefrom;
(d) determining from the scan data an enhancement output from each of the two or more regions of interest at a plurality of points in time as a result of the propagation of the fluid t

Assignees

• Medrad Inc
• Bayer Healthcare Llc

Inventors

• Kalafut John F
• Uber Iii Arthur E

Classifications

• A61B6/507

  for determination of haemodynamic parameters, e.g. perfusion CT · CPC title

• A61B6/481

  involving the use of contrast agents · CPC title

• A61B5/0295

  using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography · CPC title

• G01R33/5601

  involving use of a contrast agent for contrast manipulation, e.g. a paramagnetic, super-paramagnetic, ferromagnetic or hyperpolarised contrast agent · CPC title

• A61B6/583

  using calibration phantoms · CPC title