You are welcome, we recently released a new video on the Inverse Square Law, and will be releasing another one very soon on the Direct Square Law. Check them out!
Thank you for your reply! I agree, the positions need to be exact! Are there any specific positions you would like to see a video on, or any other subjects? We have added the Inverse Square Law and Direct Square Law, check those out as well.
If you centre on the ankle for the AP and mortice, you double the patient exposure because the foot is needlessly included. This error is global and relates to the technology available in the 1920s when projections were standardised. To correct it, centre on the joint, then angle up. Changing the tube angle like this only changes collimation as the tube focuses does not move. Alternatively, just centre a few inches above the ankle joint because that will only change the geometry of the projection by a degree or 2 which is within margins of error and variations in body habitis. Here is my xray beam geometry video th-cam.com/video/mZPD_gLs5Dw/w-d-xo.htmlsi=e5HMqOBuOfOlomlu
I respect your opinion, but I have worked with many orthopedist who would disagree with you. The centering is imperative to have an accurate representation of the joint, off centering, although mild, will still distort to joint, which can be an issue in surgical planning.
Changing a projection by 1 or 2 degrees will make no appreciable difference, particularly to AP ankle and certainly have no effect on assessing any injury or planning surgery or followup studies. There is more than 2 degrees difference in the presentation of AP ankle anatomy between a fat leg and a skinny one.@@thepenumbrabrothersexplain707
If you center exactly on the joint space, there is no change in the joint space as the geometry is exact. Angulation of the beam does not change the geometry of the beam, but off centering, even a little does.
The amount is not significant. If it was 5 degrees it would be. Considering that centring 2 inches above the joint space will reduce the radiation dose to half it is worthwhile. Why should we follow the instructions devised 100 years ago? They didn't have the light beam diaphragm and weren't concerned about dose.@@thepenumbrabrothersexplain707
You are correct, this is the Mortise view. We probably should have pointed that out, however, pretty much everyone does the Mortise and calls it an oblique, as the true 45° oblique as fallen into issue. Good eye noticing! Are there any positioning videos you would like to see?
I love this video! Thank you!
You are welcome, we recently released a new video on the Inverse Square Law, and will be releasing another one very soon on the Direct Square Law. Check them out!
日本ではかなり角度にこだわって撮影してますね。APでは私は薬指からの垂線が直角になるようにしてます。側面撮影は内果と外果が垂直になるように撮影してます。
Thank you for your reply! I agree, the positions need to be exact! Are there any specific positions you would like to see a video on, or any other subjects? We have added the Inverse Square Law and Direct Square Law, check those out as well.
If you centre on the ankle for the AP and mortice, you double the patient exposure because the foot is needlessly included. This error is global and relates to the technology available in the 1920s when projections were standardised. To correct it, centre on the joint, then angle up. Changing the tube angle like this only changes collimation as the tube focuses does not move. Alternatively, just centre a few inches above the ankle joint because that will only change the geometry of the projection by a degree or 2 which is within margins of error and variations in body habitis. Here is my xray beam geometry video th-cam.com/video/mZPD_gLs5Dw/w-d-xo.htmlsi=e5HMqOBuOfOlomlu
I respect your opinion, but I have worked with many orthopedist who would disagree with you. The centering is imperative to have an accurate representation of the joint, off centering, although mild, will still distort to joint, which can be an issue in surgical planning.
Changing a projection by 1 or 2 degrees will make no appreciable difference, particularly to AP ankle and certainly have no effect on assessing any injury or planning surgery or followup studies. There is more than 2 degrees difference in the presentation of AP ankle anatomy between a fat leg and a skinny one.@@thepenumbrabrothersexplain707
If you center exactly on the joint space, there is no change in the joint space as the geometry is exact. Angulation of the beam does not change the geometry of the beam, but off centering, even a little does.
The amount is not significant. If it was 5 degrees it would be. Considering that centring 2 inches above the joint space will reduce the radiation dose to half it is worthwhile. Why should we follow the instructions devised 100 years ago? They didn't have the light beam diaphragm and weren't concerned about dose.@@thepenumbrabrothersexplain707
This is mortas
You are correct, this is the Mortise view. We probably should have pointed that out, however, pretty much everyone does the Mortise and calls it an oblique, as the true 45° oblique as fallen into issue. Good eye noticing! Are there any positioning videos you would like to see?
@@thepenumbrabrothersexplain707 single TMJ
TMJ's are good ones too, I will add that to the lit of videos to do, thank you!