Method for ascertaining an absolute scan region on a patient
In a method and imaging device for ascertaining an absolute scan region on a patient, who is positioned on an examination table, for a subsequent medical imaging examination by operation of the medical imaging device, the height of the patient is ascertained, a relative examination region is ascertained, and the absolute scan region of the patient for the subsequent medical imaging examination is determined in a processor using the patient height and the relative examination region.
1. A method for acquiring magnetic resonance (MR) data from a patient, comprising:
providing an examination table of an MR data acquisition scanner with a marking on the examination table at a spacing A from an edge of the examination table, said examination table being movable in a longitudinal direction of said MR scanner;
placing a patient on the examination table at a patient position Ref relative to said marker on said examination table;
providing a control computer with an electronic input that designates a height H of the patient and with another electronic input that designates a section of the patient, said section of the patient being selected from the group consisting of a defined examination region of the patient and a defined organ of the patient;
in said control computer, accessing a database, after placing the patient at said patient position on said examination table, that correlates said section with said patient of said height H and, dependent on said correlation, calculating, as a range or percentage of said height H of said patient, a relative examination region that encompasses said section within said patient, said relative examination region having a start SW_Rel and an end EW_Rel in said longitudinal direction and a relative examination region length between said start and said end that is said range or percentage of said height H of said patient;
in said control computer, determining a final examination region in said scanner, from which MR image data will be acquired, said final examination region having a final examination region start SW Abs at which acquisition of said medical image data by said scanner begins, and a final examination region end EW Abs at which said acquisition of said medical image data by said scanner ceases, said final examination region and being at a length L Abs from said final examination region start SW Abs , according to:
SW
Abs
=
-
1
(
H
-
H
EW
Rel
100
-
(
Ref
-
A
)
)
,
and
L
Abs
=
-
H
EW_Rel
-
SW_Rel
100
;
and
with said control computer, operating said MR scanner to acquire said MR image data from said final examination region, and making the acquired MR data available in electronic form as an output from said control computer.
2. A magnetic resonance (MR) imaging apparatus comprising:
an MR data acquisition;
an examination table movable in a longitudinal direction into and out of said MR scanner, said examination table having a marker therein at a spacing A from an edge of the examination table, and being adapted to receive a patient thereon at a patient position Ref relative to said marker on said examination table;
a control computer configured to operate said scanner in order to acquire MR image data from said patient;
said control computer being configured to receive an electronic input that designates a height H of the patient and another electronic input that designates a section of the patient, said section of the patient being selected from the group consisting of a defined examination region of the patient and a defined organ of the patient;
after placing the patient at said patient position on said examination table, said control computer being configured to access a database that correlates said section with said height of said patient and, dependent on said correlation, to calculate, as a range or percentage of said height of said patient, a relative examination region that encompasses said section within said patient, said relative examination region having a start SW_Rel and an end EW_Rel in said longitudinal direction and a relative examination region length between said start and said end that is said range or percentage of said height H of said patient;
said control computer being configured to determine a final examination region in said scanner, from which said MR image data will be acquired, along said longitudinal direction, said final examination region having a final examination region start SW Abs at which acquisition of said medical image data by said scanner begins, and a final examination region end EW Abs at which said acquisition of said medical image data by said scanner ceases said final examination region and being at a length L Abs from said final examination region start SW Abs , according to:
SW
Abs
=
-
1
(
H
-
H
EW
Rel
100
-
(
Ref
-
A
)
)
,
and
L
Abs
=
-
H
EW_Rel
-
SW_Rel
100
;
and
said control computer being configured to operate said MR scanner to acquire said MR image data from said final examination region, and to make the acquired MR data available in electronic form as an output from said control computer.
3. A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a control computer of a magnetic resonance MR apparatus that comprises an MR data acquisition scanner and an examination table movable in a longitudinal direction into and out of said MR scanner, said examination table having a marker therein at a spacing A from an edge of the examination table, and being adapted to receive a patient thereon at a patient position Ref relative to said marker on said examination table, said programming instructions causing said control computer to:
receive an electronic input that designates a height H of the patient and another electronic input that designates a section of the patient, said section of the patient being selected from the group consisting of a defined examination region of the patient and a defined organ of the patient;
after placing the patient at said patient position on said examination table, access a database that correlates said section with said height of the patient and, dependent on said correlation, calculating, as a range or percentage of said height of said patient, a relative examination region that encompasses said section within said patient, said relative examination region having a start SW_Rel and an end EW_Rel in said longitudinal direction and a relative examination region length between said start and said end that is said range or percentage of said height H of said patient;
determine a final examination region in said scanner, from which said MR image data will be acquired along said longitudinal direction, said final examination region having a final examination region start SW Abs at which acquisition of said medical image data by said scanner begins, and a final examination region end EW Abs at which said acquisition of said medical image data by said scanner ceases, said final examination region and being at a length L Abs from said final examination region start SW Abs , according to:
SW
Abs
=
-
1
(
H
-
H
EW
Rel
100
-
(
Ref
-
A
)
)
,
and
L
Abs
=
-
H
EW_Rel
-
SW_Rel
100
;
and
operate said MR scanner to acquire said MR image data from said final examination region, and make the acquired MR data available in electronic form as an output from said control computer.