Fortunately this high dose projection is rarely done in these days of CT and MRI. In the good old days, we would collimate to an 18x24cm cassette 8x10 inches with a small up tilt. A better approach for most patients is to do the procedure prone oblique as the spinous processes can be palpated. Never use centring points derived by the number of finger widths. Judgement of the radiograph will not be according to what is in the centre. It will be by how well it is collimated. So on that measure, the dose from my approach would reduce radiation dose to 1/4. I would also use lead rubber in the corner of the image to exclude primary beam to one of the ovaries. Understand the anatomy well enough to use it directly to cause perfect collimation. That way you master radiography rather than remembering the centring point according to how many finger widths required.
Thank you! Very well explained 🙂
Fortunately this high dose projection is rarely done in these days of CT and MRI. In the good old days, we would collimate to an 18x24cm cassette 8x10 inches with a small up tilt. A better approach for most patients is to do the procedure prone oblique as the spinous processes can be palpated. Never use centring points derived by the number of finger widths. Judgement of the radiograph will not be according to what is in the centre. It will be by how well it is collimated. So on that measure, the dose from my approach would reduce radiation dose to 1/4. I would also use lead rubber in the corner of the image to exclude primary beam to one of the ovaries. Understand the anatomy well enough to use it directly to cause perfect collimation. That way you master radiography rather than remembering the centring point according to how many finger widths required.
It's very useful for my job
Thank u 👍
This is for facet ioint xray, right?