Recent changes to Options

Options modified by Ilan Tal

Ilan Tal — Tue, 03 Sep 2019 14:20:00 -0000

--- v41
+++ v42
@@ -1,4 +1,4 @@
-The options dialog appears as 
+The options dialog appears as (see [color demo](https://youtu.be/Pp1LtduJw7c))

 [[img src=PetOptions.png]]

Options modified by Ilan Tal

Ilan Tal — Mon, 20 Feb 2017 11:10:09 -0000

--- v40
+++ v41
@@ -49,3 +49,7 @@
 The buttons **Save as defaults** and **Temporary** determine whether what you just chose will be used only as temporary, experimental values or will be used as permanent values.

 Under **File** there is **Save Significant Image** to save the current image for future reference. **Directory for Significant Image** defines the path where all significant images will be stored. There is a **browse** button and also a spinner control. The spinner allows up to 10 paths, where you can easily switch from one to another to change the destination of the significant image. If you wish to save the significant images directly to the PACS, look at [dcm4chee](dcm4chee) for the **BI database**, Setup tab.
+
+In the screen shot above you might notice that the spinner in on 2. This is a directory on my local disk. Spinner=1 happens to be **ORTHANC@192.168.0.100:4242** which is location of Orthanc on my LAN.
+
+You are free to make any mix of directories, both local and remote, as well as Dicom addresses. Put them in any order you like. The most logical choice the order of preferred use, perhaps with the Dicom PACS at 0, the most important position on the list. Obviously you can't use the browse button for Dicom destinations. You need to contact your administrator to know the exact format for the particular Dicom destination.

Options modified by Ilan Tal

Ilan Tal — Mon, 20 Feb 2017 09:23:03 -0000

--- v39
+++ v40
@@ -48,4 +48,4 @@

 The buttons **Save as defaults** and **Temporary** determine whether what you just chose will be used only as temporary, experimental values or will be used as permanent values. 

-Under **File** there is **Save Significant Image** to save the current image for future reference. **Directory for Significant Image** defines the path where all significant images will be stored. If you wish to save the significant images directly to the PACS, look at [dcm4chee](dcm4chee) for the **BI database**, Setup tab.
+Under **File** there is **Save Significant Image** to save the current image for future reference. **Directory for Significant Image** defines the path where all significant images will be stored. There is a **browse** button and also a spinner control. The spinner allows up to 10 paths, where you can easily switch from one to another to change the destination of the significant image. If you wish to save the significant images directly to the PACS, look at [dcm4chee](dcm4chee) for the **BI database**, Setup tab.

Options modified by Ilan Tal

Ilan Tal — Thu, 20 Oct 2016 09:23:01 -0000

--- v38
+++ v39
@@ -48,4 +48,4 @@

 The buttons **Save as defaults** and **Temporary** determine whether what you just chose will be used only as temporary, experimental values or will be used as permanent values. 

-Under **File** there is **Save Significant Image** to save the current image for future reference. **Directory for Significant Image** defines the path where all significant images will be stored.
+Under **File** there is **Save Significant Image** to save the current image for future reference. **Directory for Significant Image** defines the path where all significant images will be stored. If you wish to save the significant images directly to the PACS, look at [dcm4chee](dcm4chee) for the **BI database**, Setup tab.

Options modified by Ilan Tal

Ilan Tal — Wed, 21 Sep 2016 13:09:40 -0000

--- v37
+++ v38
@@ -30,10 +30,6 @@

 Why would someone want to use **ignore SUV**? Iodine-124 decays with a half life of 4.1 days. The biological wash out is much faster than the half life, so the SUV is expected to be valid only up to about 24 hours. After that it makes more sense to use the manufacturer original units (most likely Bq/ml).

-[[img src=CheckBox.jpg]] **PET smooth** allows filtering of the display image. The SUV calculations are based upon the original, unfiltered data. The filter in use can be applied to the input data via Process -> Filters -> Gaussian blur, but then the SUV calculation will be affected. Here it is used for display only.
-
-There can be a small but detectable delay when switching to coronal or sagittal, or when starting 3 view. This is because the entire of stack of Images must be calculated. The stack is calculated just once. There is also **sigma (mm)** which defines how large an area is included in the smooth. The default is 2.5.
-
 [[img src=CheckBox.jpg]] **Black background** - if you prefer a black background instead of the default white.

 [[img src=CheckBox.jpg]] **best quality, z > 2.0 mm** is used to select tricubic interpolation for a professional display. If this is not checked bicubic interpolation will be used. The tricubic is felt in the coronal and sagittal views. Both intepolations are done at load time.

Options modified by Ilan Tal

Ilan Tal — Wed, 21 Sep 2016 12:34:23 -0000

--- v36
+++ v37
@@ -48,7 +48,7 @@

 [[img src=CheckBox.jpg]] **Fixed user LUT**. In the [popup menu](Popup menu) there is **Use source**. In the default case where the feature is not chosen, this uses whatever look up table is set for the postage stamp input data. This is very useful for testing new LUTs. Once you have decided that there is one LUT which is really useful, you can avoid the step of setting the input data to that LUT.

-In all 3 cases you check the box and **browse** to the appropriate LUT. You press **Save as defaults** to store it. All 3 LUTs together with **Black background** and **ignore SUV** take effect only after you restart the Pet Ct viewer.
+In all 4 cases you check the box and **browse** to the appropriate LUT. You press **Save as defaults** to store it. All 4 LUTs together with **Black background** and **ignore SUV** take effect only after you restart the Pet Ct viewer.

 The buttons **Save as defaults** and **Temporary** determine whether what you just chose will be used only as temporary, experimental values or will be used as permanent values.

Options modified by Ilan Tal

Ilan Tal — Wed, 21 Sep 2016 12:30:43 -0000

--- v35
+++ v36
@@ -36,7 +36,9 @@

 [[img src=CheckBox.jpg]] **Black background** - if you prefer a black background instead of the default white.

-[[img src=CheckBox.jpg]] **best quality** improves the image quality by using rendering filters.
+[[img src=CheckBox.jpg]] **best quality, z > 2.0 mm** is used to select tricubic interpolation for a professional display. If this is not checked bicubic interpolation will be used. The tricubic is felt in the coronal and sagittal views. Both intepolations are done at load time.
+
+What about weak hardware? Both interpolations take time, with tricubic taking more time. What if speed of loading is more important than display quality? The trick is to change the 2.0 mm to something big like 20.0 mm. Irrespective if best quality is checked or not a large value in resolution will kill both interpolations, which is more convenient for relatively weak hardware.

 There is a panel **LUTs - updated on next start of Pet Ct Viewer**, which allows you to change the default look up tables. The default LUTs are based upon GE equipment which is the environment  where the software was developed. Since your environment may be another manufacturer, you may be used to different LUTs, and this allows you to change the defaults. In [additional LUTs](Additional LUTs) there are some LUTs which you may use.

Options modified by Ilan Tal

Ilan Tal — Mon, 24 Aug 2015 12:27:03 -0000

--- v34
+++ v35
@@ -24,7 +24,11 @@

 **Right click - Slice max factor** \- when you right click on the PET image, one of the options is **Slice max**. In certain cases it might be preferred to see the data scaled to something greater than the max. 

-**PgUp, PgDn** is used with the Page up/down keys to skip up to 20 slices at a time. The arrow up and down keys skip one slice at a time. Holding down the keys will cause a rapid scroll, so there is no need for multiple clicks. 
+**PgUp, PgDn** is used with the Page up/down keys to skip up to 20 slices at a time. The arrow up and down keys skip one slice at a time. Holding down the keys will cause a rapid scroll, so there is no need for multiple clicks.
+
+[[img src=CheckBox.jpg]] **ignore SUV** allows the use of original manufacturer units, in place of SUV. In many cases the original manufacturer units are Bq/ml, but not in all cases. It is up to the user to be aware of what the manufacturer uses. Since the units are "unknown" to the system the label **Counts** is used.
+
+Why would someone want to use **ignore SUV**? Iodine-124 decays with a half life of 4.1 days. The biological wash out is much faster than the half life, so the SUV is expected to be valid only up to about 24 hours. After that it makes more sense to use the manufacturer original units (most likely Bq/ml).

 [[img src=CheckBox.jpg]] **PET smooth** allows filtering of the display image. The SUV calculations are based upon the original, unfiltered data. The filter in use can be applied to the input data via Process -> Filters -> Gaussian blur, but then the SUV calculation will be affected. Here it is used for display only.

@@ -42,7 +46,7 @@

 [[img src=CheckBox.jpg]] **Fixed user LUT**. In the [popup menu](Popup menu) there is **Use source**. In the default case where the feature is not chosen, this uses whatever look up table is set for the postage stamp input data. This is very useful for testing new LUTs. Once you have decided that there is one LUT which is really useful, you can avoid the step of setting the input data to that LUT.

-In all 3 cases you check the box and **browse** to the appropriate LUT. You press **Save as defaults** to store it. All 3 LUTs together with **Black background** take effect only after you restart the Pet Ct viewer.
+In all 3 cases you check the box and **browse** to the appropriate LUT. You press **Save as defaults** to store it. All 3 LUTs together with **Black background** and **ignore SUV** take effect only after you restart the Pet Ct viewer.

 The buttons **Save as defaults** and **Temporary** determine whether what you just chose will be used only as temporary, experimental values or will be used as permanent values.

Options modified by Ilan Tal

Ilan Tal — Mon, 24 Aug 2015 12:11:27 -0000

Options modified by Ilan Tal

Ilan Tal — Mon, 25 May 2015 13:30:09 -0000

--- v32
+++ v33
@@ -20,7 +20,7 @@

 Finally there is **SUVmean** which is the average of all pixels in the ROI.

-There is a 2nd line of ROI definitions. In this example it is **SUVmean**. It can be chosen by a right click on the PET [popup menu](Popup menu).
+There is a 2nd line of ROI definitions. In this example it is **SUVmean**. It can be chosen by a right click on the PET [popup menu](Popup menu). This may be useful when most of the time you wish to see SUVmax values, but sometimes you want to see SUVmean in the liver for a background value. Each case can have its own circle/sphere diameter and you can have the cursor look different in both cases by clicking **Show circle** differently.

 **Right click - Slice max factor** \- when you right click on the PET image, one of the options is **Slice max**. In certain cases it might be preferred to see the data scaled to something greater than the max.