DICOM - Fixing a bad DBSWin conversion.

posted by Neil Wallace - 1 Dec 2017, 11:45 a.m.

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  • Neil Wallace

On the 19th January 2017, the teckies at Software of Excellence dialled into my former practice and converted the DBSWin image data over to a dicom format.
It was not done very well, but the dicom format gives interesting possibilities.

Image metadata in the *.dic files labelled every patient as

NAME
John Doe
ID
123-45-6789
SEX
MALE
DOB
12th January 1997
DATE TAKEN
19th January 2017

This resulted in confusion (potentially litigation!) when viewing radiographs.
Below you can see the "before" and "after" view.

Before - who is this "John Doe"??
dicom before
After - metadata updated.
dicom after (Thanks to the pydicom module - I can access this trivially - along with a raft of extra parameters)

>>>import dicom
>>>dicom.read_file("11956/4094643865621.dic")

(0008, 0000) Group Length                        UL: 198
(0008, 0016) SOP Class UID                       UI: Secondary Capture Image Storage
(0008, 0018) SOP Instance UID                    UI: 1.2.840.114257.1.19012017.75659.1.1.1
(0008, 0020) Study Date                          DA: '20170119'
(0008, 0030) Study Time                          TM: '075659.265'
(0008, 0050) Accession Number                    SH: '1'
(0008, 0060) Modality                            CS: 'OT'
(0008, 0064) Conversion Type                     CS: 'DV'
(0008, 0070) Manufacturer                        LO: 'LEAD Technologies, Inc.'
(0008, 0090) Referring Physician's Name          PN: 'Reffering^Doe'
(0010, 0000) Group Length                        UL: 62
(0010, 0010) Patient's Name                      PN: 'John^Doe'
(0010, 0020) Patient ID                          LO: '123-45-6789'
(0010, 0030) Patient's Birth Date                DA: '19970112'
(0010, 0040) Patient's Sex                       CS: 'M'
(0020, 0000) Group Length                        UL: 116
(0020, 000d) Study Instance UID                  UI: 1.2.840.114257.1.19012017.75659.1
(0020, 000e) Series Instance UID                 UI: 1.2.840.114257.1.19012017.75659.1.1
(0020, 0010) Study ID                            SH: '1'
(0020, 0011) Series Number                       IS: '1'
(0020, 0013) Instance Number                     IS: '1'
(0028, 0000) Group Length                        UL: 196
(0028, 0002) Samples per Pixel                   US: 1
(0028, 0004) Photometric Interpretation          CS: 'MONOCHROME2'
(0028, 0008) Number of Frames                    IS: '1'
(0028, 0010) Rows                                US: 3221
(0028, 0011) Columns                             US: 2491
(0028, 0100) Bits Allocated                      US: 16
(0028, 0101) Bits Stored                         US: 16
(0028, 0102) High Bit                            US: 15
(0028, 0103) Pixel Representation                US: 0
(0028, 0106) Smallest Image Pixel Value          US: 0
(0028, 0107) Largest Image Pixel Value           US: 65535
(0028, 1050) Window Center                       DS: '32767.'
(0028, 1051) Window Width                        DS: '65535.'
(0028, 1052) Rescale Intercept                   DS: '0.'
(0028, 1053) Rescale Slope                       DS: '1.'
(0028, 1054) Rescale Type                        LO: 'UNSPECIFIED'
(0028, 1055) Window Center & Width Explanation   LO: ''
(7fe0, 0000) Group Length                        UL: 10411632
(7fe0, 0010) Pixel Data                          OB: Array of 10411612 bytes

In addition - all timestamps are set as the date when the conversion occurred, so the 1st job is to reset these so that directories can be perused sensibly.

neil@slim-silver /media/neil/HP_Pocket_Media_Drive/EXACTData/Xrays $ ls -lR 11956
11956:
total 64M
-rwxrwxrwx 2 neil neil  10M Jan 19  2017  4094643865621.dic
-rwxrwxrwx 2 neil neil  605 Jan 19  2017  4094643865621.mih
-rwxrwxrwx 2 neil neil  15M Jan 19  2017 '40946451537Bitewing-R(M).dic'
-rwxrwxrwx 2 neil neil  658 Jan 19  2017 '40946451537Bitewing-R(M).mih'
-rwxrwxrwx 2 neil neil  15M Jan 19  2017 '40946451985Bitewing-L(M).dic'
-rwxrwxrwx 2 neil neil  658 Jan 19  2017 '40946451985Bitewing-L(M).mih'
-rwxrwxrwx 2 neil neil 478K Jan 19  2017  4094646678727.jpg
-rwxrwxrwx 2 neil neil  598 Jan 19  2017  4094646678727.mih
-rwxrwxrwx 2 neil neil 447K Jan 19  2017 '41088486955Video undefiniert.jpg'
-rwxrwxrwx 2 neil neil  673 Jan 19  2017 '41088486955Video undefiniert.mih'
-rwxrwxrwx 2 neil neil 8.1M Feb  2  2017 '42768360239OPG undefiniert.dic'
-rwxrwxrwx 2 neil neil  695 Feb  2  2017 '42768360239OPG undefiniert.mih'
-rwxrwxrwx 2 neil neil 3.3M Feb  8  2017  42774602478RX01.DIC
-rwxrwxrwx 2 neil neil 3.4M Feb  8  2017  42774602478RX01_M.DIC
-rwxrwxrwx 2 neil neil  806 Feb  8  2017  42774602478RX01.mih
-rwxrwxrwx 1 neil neil  321 Jul 13 14:24  Patient.inf

After running this script this problem is solved.

neil@slim-silver /media/neil/HP_Pocket_Media_Drive/EXACTData/Xrays $ ls -lR 11956
11956:
total 64M
-rwxrwxrwx 2 neil neil  10M Feb  7  2012  4094643865621.dic
-rwxrwxrwx 2 neil neil  605 Feb  7  2012  4094643865621.mih
-rwxrwxrwx 2 neil neil  15M Feb  7  2012 '40946451537Bitewing-R(M).dic'
-rwxrwxrwx 2 neil neil  658 Feb  7  2012 '40946451537Bitewing-R(M).mih'
-rwxrwxrwx 2 neil neil  15M Feb  7  2012 '40946451985Bitewing-L(M).dic'
-rwxrwxrwx 2 neil neil  658 Feb  7  2012 '40946451985Bitewing-L(M).mih'
-rwxrwxrwx 2 neil neil 478K Feb  7  2012  4094646678727.jpg
-rwxrwxrwx 2 neil neil  598 Feb  7  2012  4094646678727.mih
-rwxrwxrwx 2 neil neil 447K Jun 28  2012 '41088486955Video undefiniert.jpg'
-rwxrwxrwx 2 neil neil  673 Jun 28  2012 '41088486955Video undefiniert.mih'
-rwxrwxrwx 2 neil neil 8.1M Feb  2  2017 '42768360239OPG undefiniert.dic'
-rwxrwxrwx 2 neil neil  695 Feb  2  2017 '42768360239OPG undefiniert.mih'
-rwxrwxrwx 2 neil neil 3.3M Feb  8  2017  42774602478RX01.DIC
-rwxrwxrwx 2 neil neil 3.4M Feb  8  2017  42774602478RX01_M.DIC
-rwxrwxrwx 2 neil neil  806 Feb  8  2017  42774602478RX01.mih
-rwxrwxrwx 1 neil neil  321 Jul 13 14:24  Patient.inf

Now that is done, I can use the dicom module to populate the patient name, date of birth, sex and ID fields trivially using the data from the .mih files and Patient.inf file.

I am planning that the next version of OpenMolar will be able to display these images.



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