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RadiAnt DICOM Viewer - Discussion Forum
draw straight plumb lines

Oct 31, 2015 04:20 AM
by Tommy
hi there,
is there a way I can automatically draw a straight plumb line (horizontal and vertical) over standing X-ray of the hip and pelvis to calculate height difference of the hips and iliac wings

acutally I use the measure tool but I have to pay attention that the lines I draw are exactly straight with no inclination

In other DICOM viewers I've found that using the same tool holding Ctrl or Shift results in a straight vertical or horizontal line you can use for that purpose
Nov 3, 2015 05:21 PM
by RadiAnt
try holding SHIFT while drawing the line :-)
Nov 5, 2015 05:30 AM
by Tommy
got it.

to be more precise you have to hold SHIFT just after starting drawing the line.

if you hold SHIFT before drawing the line it has no effect, that's why I did not notice this before.

thanks for the hint!!!
Nov 5, 2015 05:31 AM
by Tommy
is this on the manual too?
Nov 6, 2015 12:25 AM
by RadiAnt
If you hold Shift before pressing the left mouse button, the length measurement is overridden by panning.

This is from the manual:

"Press Shift while drawing the segment to make it either vertical or horizontal."
Nov 6, 2015 11:04 AM
by Tommy
you know... users never read the manual :-)
Nov 5, 2016 02:27 PM
by Tommy
I wonder if the same "SHIFT trick" to draw straight lines could be enabled for the angle tool as well.

I often read standing LL foot X-rays study where I have to calculate the calcaneal inclination angle, AKA "calcaneal pitch"(check Radiopaedia for some examples).

so it would be nice to easily draw "straight" baseline when tracing the first segment of the angle tool.

actually I'm using the deviation tool as a workaround but it adds additional unneeded graphic elements such as the vertical plumb line and the "delta" values

consider that I usually take screenshots of those measures and print them on paper for the referring physicians so I'd prefer to only have the angle measure displayed since other measures could be misleading to them.

so I still have to use the normal angle tool and pay attention that it's baseline is 100% straight.
Nov 10, 2016 06:05 PM
by RadiAnt
OK, it's a good idea to add the "SHIFT trick" to the angle tool.
Nov 10, 2016 08:33 PM
by Tommy
I'm glad you liked it!!!
Feb 18, 2021 06:13 AM
by Tommy
has this "shift thing" being addressed?
Feb 18, 2021 09:56 PM
by RadiAnt
We're be releasing a new beta soon. Just ping this thread if it's not there ;-)
Dec 5, 2021 04:22 AM
by Tommy
this really works, however I've a new request....
sometimes you need do draw a perfect 90° or 180° angle which is not perpendicular to your image plane...

is there any way I can rotate a 90° angle line on the image plan without losing its internal 90° value?

doing it by hand is often time consuming and not 100% accurate since most of the times you hand up with 89° or 91° final values

Dec 20, 2021 12:14 AM
by RadiAnt
No, currently there is no way to rotate a drawn ROI.
We've added your request to the to-do list, Tommy.
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