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demonstrated that mismatches can cause mean errors of up to ☓5% in clinical human studies comparing CT attenuation correction to conventional PET transmission scans with germanium sources ( 5). They also showed that misregistration along the diaphragm causes global quantitation errors on the PET image and erroneous heterogeneity in the myocardium. showed in a canine study that CT performed at end-exhalation or end-inhalation results in PET myocardial regional errors on the order of ☖% ( 4). Simulation studies of dynamic phantoms have shown errors of as much as ☒5% on attenuation-corrected PET images from respiratory motion–mismatched CT acquisitions ( 3). The effects of respiratory motion on attenuation–emission scan mismatch with PET/CT scanners has received growing interest in the past few years and has been explored for both oncologic and cardiac applications. The potential attenuation and emission misalignment dramatically reduces the accuracy of attenuation correction, leading to serious artifacts in the PET image in a large fraction of studies. The integrated modalities provide distinct and complementary information: PET offers functional measurement of myocardial perfusion and metabolism, whereas contrast-enhanced CT angiography offers structural assessment of coronary anatomy and atherosclerotic burden ( 1, 2).Ī limitation with cardiac PET on a PET/CT system is that the PET attenuation map formed from a helical CT acquisition represents a snapshot of the respiratory cycle, whereas the PET image is acquired over multiple respirations. I would like to see the ability to group large sections together so I can move them around together in the scene.PET combined with CT in an integrated PET/CT scanner offers a single-study, noninvasive technique for the diagnosis of coronary artery disease. I like to build overhead rigs which require a lot of truss. I would like an input field for truss length. Sometimes I would have to fly around and change views a lot just to get the truss to line up properly. I see you already have a snap function, but this didn't seem to work very well with truss. I would like a button in the pop-up menu that allows me to rotate the truss by 90 or 180 degrees with one click. I would also like the ability to manually input a number so I can line the objects up better. I would like a pop-up menu with the exact XYZ coordinates of the truss in the digital space. This function is borrowed from Photoshop and Vectorworks: I would like the ability to click and drag on the screen to select multiple objects and create groups. One time while I was building an elaborate truss system, I removed a piece on accident and spent the next five minutes trying to put it back. I would like to see a prompt on screen asking me: "Confirm Delete?" before I remove an object. I was expecting to hit Ctrl + Z, but that function didn't work. More than once while I was building a scene, I would accidentally delete an object. Sometimes during gameplay, I couldn't even see the cursor, especially against a blue or white sky. I would like to choose the crosshair size from this menu. I see your game does have a user settings menu.