US 8,427,155 B2 · Method and device to control a workflow of an MR measurement in a magnetic resonance system

Abstract

In a method and a device to control a workflow of an MR measurement in a magnetic resonance system, MR signals from multiple slices of a predetermined volume segment of an examination subject are acquired, multiple slices with a continuous table feed. In the MR measurement, one of these multiple slices in the active volume of the magnetic resonance system is repeatedly measured in succession at different measurement positions Pi in an order corresponding to the index of the measurement positions Pi. The measurement positions Pi are determined via the following Equation, starting from a largely arbitrary first measurement position P1 selected in the active volume of the magnetic resonance system: P i = P i - 1 + d × ( ± c - 1 + c c + e × ( 1 - TR - TB TR ) ) , ⁢ ⁢ ⁢ for ⁢ ⁢ i = 2 , … ⁢ , c + e , wherein d is a slice interval, c is a natural number greater than 1 and e is a whole number that is not greater than c and not less than 0. The number of measurement positions Pi in the active volume results from the sum of c and e. TB indicates a time period from the beginning of an excitation at one measurement position to the beginning of a chronologically next excitation at a measurement position nearest the measurement position. TR is a middle time period from the beginning of one excitation of a slice to the beginning of a chronologically next excitation of an additional slice and “±” means “+” if an excitation order follows a direction of the table displacement, and otherwise is “−”.

Claims40

Dependent claims

A method to control a workflow of a magnetic resonance measurement in an MR system having an active volume, comprising:

exciting nuclear spins in and acquiring resulting MR signals from multiple slices of a predetermined volume segment of an examination subject in the MR system during a continuous table feed of a table on which the subject is supported;
repeatedly exciting nuclear spins in and acquiring resulting MR signals from one of the respective multiple slices in the active volume of the magnetic resonance system in succession at different measurement positions Pi in an order corresponding to the index of the measurement positions Pi;
and
determining the measurement positions Pi by the following equation, starting from an arbitrary first measurement position P1 selected in the active volume of the magnetic resonance system:
P
i
⁢
P
i
-
1
+
d
×
(
±
c
-
TR
-
TB
TR
)
,
for
⁢
⁢
i
=
2
,
…
⁢
,
c
,
wherein d is a slice interval, wherein c is a natural number greater than 1 that indicates a number of measurement positions Pi in the active volume, wherein TB is a time period from a beginning of an excitation at one measurement position to the beginning of a chronologically next excitation at a measurement position nearest the measurement position, wherein TR is a time period which can be calculated depending on the slice interval d and a table velocity, and wherein “±” is “+” if an excitation order in which the slices are excited follows a direction of the a movement path of the table (2), and otherwise is “−”.

34 more elements

A method to control a workflow of a magnetic resonance measurement in an MR system having an active volume, comprising:

exciting nuclear spins in and acquiring resulting MR signals from multiple slices of a predetermined volume segment of an examination subject in the MR system during a continuous table feed of a table on which the subject is supported;
repeatedly at least exciting nuclear spins in the multiple slices successively in the active volume of the magnetic resonance system at different measurement positions Pi in an order corresponding to the index of the measurement positions Pi;
and
determining the measurement positions Pi by the following equation, starting from an arbitrary first measurement position P1 determined in the active volume of the magnetic resonance system:
P
i
=
P
i
-
1
+
d
×
(
±
c
-
1
+
c
c
+
e
×
(
1
-
TR
-
TB
TR
)
)
,
⁢
⁢
for
⁢
⁢
i
=
2
,
…
⁢
,
c
+
e
,
wherein d is a slice interval, c is a natural number greater than 1, wherein e is a natural number for which 1≦e≦c applies, wherein a sum of c and e is equal to the number of measurement positions Pi in the active volume, wherein TB is a time period from the beginning of one excitation at one measurement position to the beginning of an excitation at the measurement position nearest the measurement position, wherein TR is a time period which can be calculated depending on the slice interval d, a table velocity, c and e, and wherein “±” is “+” if an excitation order in which the slices are excited follows a direction of a travel path of the table, and otherwise is “−”.

49 more elements

A magnetic resonance system comprising:

a magnetic resonance data acquisition device having an active volume and comprising a patient table adapted to support an examination subject thereon;
a computerized control unit that operates said magnetic resonance data acquisition device;
and
said computerized control unit being configured to operate said data acquisition unit to excite nuclear spins in and acquire resulting MR signals from multiple slices of a predetermined volume segment of an examination subject in the MR system during a continuous table feed of said table on which the subject is supported, and to repeatedly excite nuclear spins in and acquire resulting MR signals from one of the respective multiple slices in the active volume of the magnetic resonance system in succession at different measurement positions Pi in an order corresponding to the index of the measurement positions Pi, and to determine the measurement positions Pi by the following equation, starting from an arbitrary first measurement position P1 selected in the active volume of the magnetic resonance system:
P
i
=
P
i
-
1
+
d
×
(
±
c
-
TR
-
TB
TR
)
,
for
⁢
⁢
i
=
2
,
…
⁢
,
c
,
⁢
wherein d is a slice interval, wherein c is a natural number greater than 1 that indicates a number of measurement positions Pi in the active volume, wherein TB is a time period from a beginning of an excitation at one measurement position to the beginning of a chronologically next excitation at a measurement position nearest the measurement position, wherein TR is a time period which can be calculated depending on the slice interval d and a table velocity, and wherein “±” is “+” if an excitation order in which the slices are excited follows a direction of the a movement path of the table (2), and otherwise is “−”.

35 more elements

A magnetic resonance system comprising:

a magnetic resonance data acquisition unit having an active volume and comprising a patient table adapted to support an examination subject thereon;
a computerized control unit that operates said magnetic resonance data acquisition unit;
and
said computerized control unit being configured to operate said data acquisition unit to excite nuclear spins in and acquiring resulting MR signals from multiple slices of a predetermined volume segment of an examination subject in the MR system during a continuous table feed of said table on which the subject is supported, and to repeatedly at least excite nuclear spins in the multiple slices successively in the active volume of the magnetic resonance system at different measurement positions Pi in an order corresponding to the index of the measurement positions Pi, and to determine the measurement positions Pi by the following equation, starting from an arbitrary first measurement position P1 determined in the active volume of the magnetic resonance system:
P
i
=
P
i
-
1
+
d
×
(
±
c
-
1
+
c
c
+
e
×
(
1
-
TR
-
TB
TR
)
)
,
⁢
⁢
for
⁢
⁢
i
=
2
,
…
⁢
,
c
+
e
,
wherein d is a slice interval, c is a natural number greater than 1, wherein e is a natural number for which 1≦e≦c applies, wherein a sum of c and e is equal to the number of measurement positions Pi in the active volume, wherein TB is a time period from the beginning of one excitation at one measurement position to the beginning of an excitation at the measurement position nearest the measurement position, wherein TR is a time period which can be calculated depending on the slice interval d, a table velocity, c and e, and wherein “±” is “+” if an excitation order in which the slices are excited follows a direction of a travel path of the table, and otherwise is “−”.

49 more elements

Dependencies are inferred from the claim text.

Method and device to control a workflow of an MR measurement in a magnetic resonance system

Life of this patent

Method and device to control a workflow of an MR measurement in a magnetic resonance system

Life of this patent

Abstract

Claims40