Magnetic resonance system and method for control thereof

A method to control a magnetic resonance system includes at least one protocol step for measurement data acquisition with the magnetic resonance system, and at least one operator interaction step which allows an operator to enter information that affects at least one subsequent step in the control of the magnetic resonance system.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention concerns a method to control a magnetic resonance system, of the type having at least one protocol step for measurement data acquisition with the magnetic resonance system according to a measurement protocol, as well as a magnetic resonance system to execute such a method.

2. Description of the Prior Art

Control methods (frequently also designated as measurement programs) of the general type noted above are known and serve to implement an examination of a patient with a magnetic resonance system as optimally as possible. Such measurement programs (also known as organ programs, for example) are largely executed automatically without users being able to input additional information.

The core of such control methods are program steps that describe measurement tasks that are executed successively by the magnetic resonance system, meaning that measurement data representing magnetic resonance images are acquired. Each of these protocol steps is planned independently in advance. The possibility to insert pause steps (in which contrast agent can be administered, for example) into the method workflow is known. Pop-up windows can be provided that contain an appropriate instruction to the operator, and the operator can then end the pause by a confirmation button or the like. The pop-up windows are superimposed on an operating screen of the magnetic resonance system. The next protocol step is subsequently executed with the next measurement protocol.

This means that control methods known today for magnetic resonance systems are quite rigid in their workflow as it was defined initially. If an operator would like to adapt the method workflow or individual protocol steps—for example based on specific patient properties or observations—the method workflow must be interrupted and the changes must be implemented individually for every protocol step, thus through the steps “Open”, “Edit”, “Close”. It can thereby also be necessary to make the same adjustments multiple times.

If, during the examination, evaluations of the images are made—for example marking of regions of interest—the examination mask must be exited. The measurement data on which the evaluation should be conducted must be loaded onto another operating device or into another user interface so that the corresponding evaluation application can be opened. When the evaluation is terminated, the operator returns with the result to the examination and plans the further continuation of the examination based on this evaluation for every protocol step.

This conventional procedure is very laborious and inflexible and requires a high time outlay from the operator. Faulty measurements and operating errors can additionally occur since a user can overlook manual operating steps.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a method to control a magnetic resonance system that is improved with regard to user friendliness and flexibility.

To achieve this object, in a method of the aforementioned type, at least one operating interaction step is provided according to the invention that allows an operator to enter (input) information in the method workflow.

The operating interaction is incorporated as a component of the control method in the method workflow so that an improved user direction can be conducted by the examination to be implemented. In contrast to a pause step with a measurement pause that can be ended by the operator, which naturally also can be an additional part of the method according to the invention, the operating interaction step is characterized by allowing information to be input that actually affects the further (subsequent) workflow of the control method. It is thus no longer necessary for the operator to exit the examination; rather, modifications can be integrated into the ongoing examination workflow. Moreover, possible operating errors are also reduced since the operator cannot forget that possible additional manual operating steps must be taken.

The operating interaction step can be at least one planning step for adjustment by the operator of acquisition parameters of at least one following protocol step and/or at least one evaluation step to evaluate measurement data acquired in a preceding protocol step using an evaluation algorithm, and for adjustment by the operator of acquisition parameters of at least one following protocol step depending on the evaluation result and/or at least one decision step for a decision by the operator about the further method workflow, in particular for the selection of at least one method segment including at least one additional protocol step.

The above examples for operating interaction steps represent in more detail the manner in which situations an operator interaction can occur in the method according to the invention. A planning step serves for the planning of at least one following protocol step in the workflow of the control method itself. Acquisition parameters defined in a planning step for at least two following protocol steps (preferably for all following protocol steps) can be adopted. For example, in this embodiment it is possible not only to produce a plan for a single protocol step but also to set information (thus acquisition parameters) that then in particular is valid for the entire further method workflow. This means that the acquisition parameters are stored and later used by the required protocol steps. A planning step thus can require the operator to plan the slices for all following measurements, for example on a user interface. The operator does this and confirms the positioning. In the following steps the stored information of the slice planning can be retrieved again. Another example of the usage of planning steps is the possibility of short-term consideration of additional patient properties. For example, if it is established that the patient is not in the position to hold his breath given selection of a protocol that provides a breath-hold of the patient, this can be communicated to the control method and said control method can be correspondingly adapted, for example in that an acquisition technique is used that manages without a breath-hold.

Furthermore, it is possible to use at least one evaluation step. In an evaluation step that represents a portion of the control method, an evaluation algorithm can be applied to already-acquired measurement data. The operator can possibly also select which evaluation algorithm he would like to apply to which measurement data. The evaluation result is displayed to the operator so that said operator can adjust or even modify corresponding acquisition parameters that affect the subsequent protocol steps. In this case it is also possible for acquisition parameters, defined in an evaluation step for at least two following protocol steps (in particular all following protocol steps) to be adopted. The advantage also results (as in the planning step) that inputs do not need to be laboriously implemented for all protocol steps, such that the effort is reduced and the user friendliness is improved. For example, in an evaluation step a region of interest can be marked, whereupon an intensity-time curve can be calculated and displayed from the measurement data/magnetic resonance images acquired beforehand. Based on this, at least one subsequent protocol step can be planned in the method workflow. Given a measurement with contrast agents, another example would be to initially inject a test bolus, to evaluate the measurement data and then to make an adaptation or to adopt these contrast agent parameters.

The aforementioned decision step is another advantageous example of an operating interaction step. In such a decision step the operator can make adjustments at a specific point in the control method, which adjustments can affect the further method workflow. These adjustments are then for the most part based on a visual evaluation of already-acquired measurement data, which means that it can be provided that the already-acquired magnetic resonance images are always displayed at the decision step (which necessarily requires a pause). If the operator now recognizes a circumstance indicating plaque in the carotid, he can choose whether the method is continued with a plaque program or flow measurements in order to acquire additional information via the examination. Another example is the detection of a tumor, wherein the following method workflow can, for example, be selected differently depending on the tumor type. It is noted that, for example, acquisition parameters can also be adapted in a decision step. As already described, such adaptations can also advantageously apply for all following protocol steps.

Overall, in this embodiment the method according to the invention thus enables the method elements of protocol step and pause step that are provided in the prior art to be expanded with additional elements, for example here planning step, evaluation step and decision step. Like the pause step, these steps do not trigger a measurement but require an operator interaction. The activities of planning, evaluation and deciding are integrated into the examination workflow so that time is saved and the focus is kept on the examination itself.

In a further embodiment of the method according to the invention at least one planning step and/or at least one evaluation step and/or at least one decision step are inserted, defined by the operator, into a predefined method workflow. Even if a predefined program (for example an organ program) has been selected for an examination, it is possible for the operator to insert operator interaction steps at points that he has established in the method workflow. For example, this can occur via a user interface in which the additional elements of pause step, planning step, evaluation step and decision step can simply be added into the method workflow. In this way a user can flexibly adapt the measurement program so that an optimal user direction is provided.

In addition to the method, the present invention also concerns a magnetic resonance system fashioned to implement the method according to the invention. This accordingly offers an improved operating concept which, in addition to enabling a better user direction, also reduces operating errors.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1shows a magnetic resonance system1according to the invention. The system1has a scanner2(basic field magnet) in which a patient can be inserted through a patient receptacle3. The design of the scanner2with gradient coils, radio-frequency coils and the like is generally known and need not be described in further detail herein.

The magnetic resonance system1also has an operating device4with a display device5and an input device6via which the control of the magnetic resonance system1ensues. The magnetic resonance system1is fashioned to implement the method according to the invention, as explained in detail in the following with reference toFIG. 2.

FIG. 2shows a flowchart of an embodiment of the method according to the invention. The present example of a method according to the invention—which naturally is not limited with regard to its steps—includes a number of protocol steps7, a planning step8, an evaluation step9, a pause step10and a decision step11, These elements (protocol step7, planning step8, evaluation step9, pause step10, decision step11) form the basic components of every control method according to the invention and can ultimately occur in arbitrary numbers. The planning step8, the evaluation step9and the decision step11require the operator to input information that can affect the further method workflow. This is explained in detail using the example shown inFIG. 2.

First, acquisition parameters that can be valid for specific following protocol steps7—however in particular can also be valid for more than one, preferably all, protocol steps7—are defined directly or indirectly by the operator in planning step8. The entire measurement process that is composed of different measurements in the protocol steps7thus can be planned in a simple manner in the planning step8.

A first acquisition of measurement data according to a measurement protocol and the acquisition parameters (defined in particular in Step8) then ensues in Step7. Such an acquisition of measurement data ensues in every protocol step7. The measurement data describe magnetic resonance images that are to be evaluated later. Presently a measurement with a test bolus should now be implemented first in first protocol step7.

In the evaluation step9the measurement data of the preceding protocol step7are now evaluated with an evaluation algorithm, whereupon the evaluation result is presented to an operator at the display device5. This operator assesses the evaluation result and can thereupon define and/or adapt acquisition parameters. As already is the case in planning step8, these apply not only for the next protocol step7but also beyond this. For example, the injection scheme for the contrast agent can now be adapted.

Additional measurement data are now acquired in protocol step7following the evaluation step7. A pause step10follows this in which new contrast agent is injected and the conducted injection is then confirmed by the operator. An additional measurement data acquisition can then ensue in a third protocol step7.

In decision step11the acquired magnetic resonance images that are reconstructed from the measurement data are then displayed to the operator. Based on these displayed images the operator can now decide how the examination should proceed further. For example, if a tumor is detected, different additional method steps can be reasonable for a benign tumor than for a malignant tumor. This is indicated in the present example by the protocol steps7following the arrows12.

Planning, evaluation and deciding are thus incorporated in this way into the control method during the examination, such that the user friendliness increases significantly.

Within the scope of the method according to the invention it is also possible for an operator to insert operator interaction steps or pause steps into the method workflow in advance. For example, this can ensue via a user interface13as it is shown inFIG. 3. There method steps14with intervening spaces15are shown to the left. Different step types16can be selected on the right side—for example by means of a cursor17—and can be moved into the intervening spaces15by a drag-and-drop procedure, as is indicated by the box18drawn in dashed lines.

The operator can thus arbitrarily adapt the method workflow to his or her requirements.