A medical system (100, 300, 700) comprising: - a magnetic resonance imaging system configured to acquire lines of k-space data from a thoracic region of a subject; - a memory storing machine executable instructions and pulse sequence commands, wherein the pulse sequence commands are configured to repeatedly acquire the lines of k-space data according to a three-dimensional free running cardiac magnetic resonance imaging protocol, wherein the pulse sequence commands are configured to repeatedly acquire the lines of k-space data for a predetermined region of interest, wherein the memory further comprises a deformable cardiac model, wherein the deformable cardiac model is three-dimensional, wherein the deformable cardiac model memory further defines a set of planes; - a computational system, wherein execution of the machine executable instructions causes the computational system to: - repeatedly acquire the lines of k-space data by controlling the magnetic resonance imaging system with the pulse sequence commands; - repeatedly assemble motion resolved k-space data from the lines of k-space data using at least one cardiac phase and one respiratory phase of the subject as the k-space data is acquired; - retrieve at least a portion of the motion resolved k-space data during acquisition of the k-space data; - construct a preliminary three-dimensional cardiac image using at least a portion of the motion resolved k-space data before acquisition of the lines of k-space data is finished; - construct a fitted cardiac model by fitting the deformable cardiac model to the preliminary three-dimensional cardiac image, wherein fitting the deformable cardiac model to the preliminary three-dimensional cardiac image adjusts the location of the set of planes in the fitted cardiac model, wherein the set of planes comprises at least one cardiac viewing plane; and - provide the at least one cardiac viewing plane. - a magnetic resonance imaging system configured to acquire lines of k-space data from a thoracic region of a subject; - a memory storing machine executable instructions and pulse sequence commands, wherein the pulse sequence commands are configured to repeatedly acquire the lines of k-space data according to a three-dimensional free running cardiac magnetic resonance imaging protocol, wherein the pulse sequence commands are configured to repeatedly acquire the lines of k-space data for a predetermined region of interest, wherein the memory further comprises a deformable cardiac model, wherein the deformable cardiac model is three-dimensional, wherein the deformable cardiac model memory further defines a set of planes; - a computational system, wherein execution of the machine executable instructions causes the computational system to: - repeatedly acquire the lines of k-space data by controlling the magnetic resonance imaging system with the pulse sequence commands; - repeatedly assemble motion resolved k-space data from the lines of k-space data using at least one cardiac phase and one respiratory phase of the subject as the k-space data is acquired; - retrieve at least a portion of the motion resolved k-space data during acquisition of the k-space data; - construct a preliminary three-dimensional cardiac image using at least a portion of the motion resolved k-space data before acquisition of the lines of k-space data is finished; - construct a fitted cardiac model by fitting the deformable cardiac model to the preliminary three-dimensional cardiac image, wherein fitting the deformable cardiac model to the preliminary three-dimensional cardiac image adjusts the location of the set of planes in the fitted cardiac model, wherein the set of planes comprises at least one cardiac viewing plane; and - provide the at least one cardiac viewing plane. - repeatedly acquire the lines of k-space data by controlling the magnetic resonance imaging system with the pulse sequence commands; - repeatedly assemble motion resolved k-space data from the lines of k-space data using at least one cardiac phase and one respiratory phase of the subject as the k-space data is acquired; - retrieve at least a portion of the motion resolved k-space data during acquisition of the k-space data; - construct a preliminary three-dimensional cardiac image using at least a portion of the motion resolved k-space data before acquisition of the lines of k-space data is finished; - construct a fitted cardiac model by fitting the deformable cardiac model to the preliminary three-dimensional cardiac image, wherein fitting the deformable cardiac model to the preliminary three-dimensional cardiac image adjusts the location of the set of planes in the fitted cardiac model, wherein the set of planes comprises at least one cardiac viewing plane; and - provide the at least one cardiac viewing plane.