Frequently Asked Question
Excessive picture brightness, wrong contrast in the picture.
Last Updated 4 years ago
You can read the article (Russian language). PDF file in attachment. All screenshots in high resolution are available in attachments.
To normalize the series by density levels for our Viewer, you can do the following:
Screenshot with the old interface of Inobitec DICOM Viewer (before version 2.0)
Screenshot with the new interface of Inobitec DICOM Viewer (after version 2.0)
Screenshot with the old interface of Inobitec DICOM Viewer (before version 2.0)
Screenshots with the new interface of Inobitec DICOM Viewer (after version 2.0)
Screenshot with the old interface of Inobitec DICOM Viewer (before version 2.0)
Screenshot with the new interface of Inobitec DICOM Viewer (after version 2.0)
There are 2 fields of interest to us in this window. These are “Width” and “Center”. Center - the value is taken approximately in the middle of the density. Width - the deviation from this value by the specified value, where the smallest and largest value will be completely black and absolutely white. Take the value of mid-2000, and the width of 1000, the result on the preview in the window will differ from the result on the series. You can see the result of these settings in the first screenshot.
Screenshot of the Window/Level Settings tool icon with the old interface of Inobitec DICOM Viewer (before version 2.0)
Screenshot of the Window/Level Settings tool icon with the new interface of Inobitec DICOM Viewer (after version 2.0)
Instructions Links:
Chapter 2. View Flat Images
2.12. Set Window Level and Width
2.16. Visualize Images
To normalize the series by density levels for our Viewer, you can do the following:
- Open the study and series you need. In the screenshot below, the same series is open, before window / level settings and after. In this study, the rear wall of the apparatus was captured, so the average density level has shifted.
Screenshot with the old interface of Inobitec DICOM Viewer (before version 2.0)
Screenshot with the new interface of Inobitec DICOM Viewer (after version 2.0)
- The green arrows indicate the "Custom WL" and" Rendering transfer function" icons. Instructions on these functions are available at this link, and in section 2.16.3
- By clicking the “Rendering transfer function” button, you will see a graph below.
- The left red arrow is the subject of research. The right red arrow is the capture of the cab, you do not need this part of the graph. You must understand that this is an example, and each study is unique and needs to be evaluated. To zoom in on the graph, there is a horizontal scrollbar at the bottom. To change the height of the graph, scroll the mouse wheel. You can scroll the entire graph horizontally by dragging it with the left mouse button.
Screenshot with the old interface of Inobitec DICOM Viewer (before version 2.0)
- After zooming in on the graph, you can see: Density will be from ~988 to ~3000.
- By clicking the "Custom WL" button you will see the window:
Screenshot with the old interface of Inobitec DICOM Viewer (before version 2.0)
Screenshot with the new interface of Inobitec DICOM Viewer (after version 2.0)
There are 2 fields of interest to us in this window. These are “Width” and “Center”. Center - the value is taken approximately in the middle of the density. Width - the deviation from this value by the specified value, where the smallest and largest value will be completely black and absolutely white. Take the value of mid-2000, and the width of 1000, the result on the preview in the window will differ from the result on the series. You can see the result of these settings in the first screenshot.
- In the same way, you can adjust the display of research for yourself. You can also change the contrast using the "Adjust W/L" tool.
- You can change the value of levels by holding down the left mouse button and moving it in horizontal and vertical planes.
Instructions Links:
Chapter 2. View Flat Images
2.12. Set Window Level and Width
2.16. Visualize Images