How to use it
- Move through slices with the mouse wheel, by dragging up or down on the image, with the slider or with the arrow keys. On a phone, swipe up or down on the image.
- Names of the structures in the slice sit beside the image, with a line to each. Point at a name, or at the image, to highlight the structure; click or tap to keep it highlighted. On a phone the names are numbered on the image and listed under it.
- In the CT, the abdomen and pelvis MRI and the pelvis MRI, axial and coronal images name one side at a time: choose the patient’s left or right. A structure that is not one of a pair is named on the side where it lies in the slice (the liver when Right is chosen), and on both sides when it lies within 10 mm of the midline. The prostate scan has no paired labels, so it names everything in the slice. Group buttons turn names on or off.
- “Scan” switches between the CT of the abdomen and pelvis, the MRI of the abdomen and pelvis, the pelvis MRI and the prostate MRI. For the CT, “Window” changes only how the CT numbers are shown as greys: soft tissue (W 400, L 40, the default), lung (W 1500, L −600) or bone (W 1800, L 400). The MRI greys are fixed. The pelvis and prostate MRIs were acquired as axial slices only, so they have no sagittal or coronal views.
- Click or tap the image to set the crosshair; the other planes move to that point. Search for a structure to jump to its largest cross-section.
- Quiz: “Find it” asks you to click a structure; “Name it” highlights one and offers four names, the wrong ones mostly its neighbours; “Left or right?” highlights one with the side letters hidden and asks which side of the patient it is on (it asks only about structures that come in pairs, which the prostate scan does not label). Each question shows a random slice through the structure, in a random plane unless you choose one; the pelvis and prostate MRIs have axial slices only. Names stay hidden during a question unless you reveal them, which scores no point. Your best score for each scan and setting stays in this browser only.
- With an image selected: ↑ ↓ and Page Up Page Down move through slices; Shift with an arrow key moves the crosshair; Enter highlights the structure at the crosshair (in “Find it”, answers), Esc clears it and L shows or hides the labels. In “Name it”, 1–4 choose an answer.
About the images
The atlas holds four real scans from open datasets that allow reuse: a CT of the abdomen and pelvis from the TotalSegmentator dataset, which lists no pathology for it; MRIs of the abdomen and pelvis and of the pelvis from the TotalSegmentator MRI dataset, which does not record findings for its scans; and a patient’s prostate MRI from the PROSTATEx collection, with the prostate’s zones drawn by hand, whose one recorded finding is marked not clinically significant. No scan has been read by a radiologist for this atlas; it is for learning anatomy, not diagnosis. “Scan” switches between them; what follows is about the scan shown.
Axial and coronal images follow the radiological convention: the patient’s right is on the viewer’s left. Sagittal images have anterior on the left. Letters at the image edges show the directions.