Issue 618 (#618)

rordenlab · Jul 20, 2022 · 160aaa2 · 160aaa2
1 parent 26a74a5
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Showing 3 changed files with 17 additions and 7 deletions.
diff --git a/BIDS/README.md b/BIDS/README.md
@@ -35,6 +35,7 @@ The Defined By column uses:
 
 The Unit column uses:
 
+- b : boolean
 - deg : degrees
 - f : fraction
 - kg : Kilogram
@@ -316,17 +317,19 @@ Fields specific to Siemens V*-series (e.g. VB, VE) MRI systems (e.g. Verio, Trio
 | DwellTime                      |                                                 | DICOM tag 0019,1018                                                                                                                                                                                                                                                                                                                                                                                    | B          |
 | BandwidthPerPixelPhaseEncode   | Hz                                              | DICOM tag 0019,1028                                                                                                                                                                                                                                                                                                                                                                                    | D          |
 | ImageOrientationText           |                                                 | DICOM tag 0051,100E                                                                                                                                                                                                                                                                                                                                                                                    | D          |
+| NonlinearGradientCorrection    | b                                               | DICOM tag 0008,0008                                                                                                                                                                                                                                                                                                                                                                                    | B          |
 
 ### Manufacturer Siemens Magnetic Resonance Imaging (XA)
 
 Fields specific to Siemens XA-series MRI systems (Sola, Vida).
 
-| Field                        | Unit | Comments            | Defined By |
-|------------------------------|------|---------------------|------------|
-| ReceiveCoilActiveElements    |      | DICOM tag 0021,114F | B          |
-| BandwidthPerPixelPhaseEncode | Hz   | DICOM tag 0021,1153 | D          |
-| ScanningSequence             |      | DICOM tag 0021,105a | D          |
-| PostLabelDelay               | s    | DICOM tag 0018,9258 | D          |
+| Field                        | Unit | Comments               | Defined By |
+|------------------------------|------|------------------------|------------|
+| ReceiveCoilActiveElements    |      | DICOM tag 0021,114F    | B          |
+| BandwidthPerPixelPhaseEncode | Hz   | DICOM tag 0021,1153    | D          |
+| ScanningSequence             |      | DICOM tag 0021,105a    | D          |
+| PostLabelDelay               | s    | DICOM tag 0018,9258    | D          |
+| NonlinearGradientCorrection  | b    | 0008,0008 or 0021,1175 | B          |
 
 ### Manufacturer UIH
 

diff --git a/Siemens/README.md b/Siemens/README.md
@@ -82,7 +82,7 @@ The Siemens CSA header also stores some ASL details as a base64 stream. These ca
 
 ## Nonlinear Gradient Correction
 
-dcm2niix does not populate the recommended [NonlinearGradientCorrection](https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/01-magnetic-resonance-imaging-data.html#sequence-specifics) BIDS tag. dcm2niix does save the DICOM  [Image Type (0008,0008)](https://dicom.innolitics.com/ciods/rt-dose/general-image/00080008) tag as `ImageType`, and recent versions will also export a private tag (0021,1175) as `ImageTypeText`. The inclusion of `DIS2D` or `DIS3D` in these one of these fields (the former prior to XA30, the latter with XA30 and later) is consistent with `NonlinearGradientCorrection` being `True`. See [issue 597](https://github.com/rordenlab/dcm2niix/issues/597) for further details.
+dcm2niix does not populate the recommended [NonlinearGradientCorrection](https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/01-magnetic-resonance-imaging-data.html#sequence-specifics) BIDS tag. dcm2niix does save the DICOM  [Image Type (0008,0008)](https://dicom.innolitics.com/ciods/rt-dose/general-image/00080008) tag as `ImageType`, and recent versions will also export a private tag (0021,1175) as `ImageTypeText`. The inclusion of `DIS2D` or `DIS3D` in these one of these fields (the former prior to XA30, the latter with XA30 and later) is consistent with `NonlinearGradientCorrection` being `true` while `ND` suggests `false`. See [issue 597](https://github.com/rordenlab/dcm2niix/issues/597) for further details.
 
 ## Sample Datasets
 

diff --git a/console/nii_dicom_batch.cpp b/console/nii_dicom_batch.cpp
@@ -1326,6 +1326,13 @@ tse3d: T2*/
 		}
 		fprintf(fp, "\"],\n");
 	}
+	if ((strstr(d.imageTypeText, "_DIS2D") != NULL) || (strstr(d.imageType, "_DIS2D") != NULL) ||
+		(strstr(d.imageTypeText, "_DIS3D") != NULL) || (strstr(d.imageType, "_DIS3D") != NULL))
+			fprintf(fp, "\t\"NonlinearGradientCorrection\": true,\n");
+	if ((strstr(d.imageTypeText, "_ND") != NULL) || (strstr(d.imageType, "_ND") != NULL) ||
+		(strstr(d.imageTypeText, "_ND") != NULL) || (strstr(d.imageType, "_ND") != NULL))
+			fprintf(fp, "\t\"NonlinearGradientCorrection\": false,\n");
+
 	if (d.isDerived) //DICOM is derived image or non-spatial file (sounds, etc)
 		fprintf(fp, "\t\"RawImage\": false,\n");
 	if (d.seriesNum > 0)