fidoptSynthRAD2025, CBCT to CT, head and neck
Cone-beam CT of one head and neck patient and the CT to synthesise from it, which the challenge registered onto the CBCT's grid (SynthRAD2025, Task 2).
24 test caseshead and necksource CBCT, target CTresearch only
Read before comparing (5)
- Case. The challenge's pair, copied byte for byte from the organisers' training archive: the CBCT, the CT they registered rigidly onto its grid, and their body mask. The synthetic image is scored inside that mask, as the challenge scores it.
- Alignment. What the organisers' registration left misaligned counts as error for every method: it decides how far a perfect synthesis can match the target.
- Baseline. Inside the mask on the 24 test cases, at CT's range of 4095, a constant at the target's median scores an MAE of 291 HU (206 to 369), a PSNR of 18.5 dB (17.4 to 20.8) and an SSIM of 0.23 (0.10 to 0.34). The CBCT itself scores 201 HU (115 to 252), 23.6 dB (20.7 to 26.9) and 0.41 (0.27 to 0.63), better than the constant on all 24.
- Overlap. Only SynthRAD2025's four registration sets and DoseRAD2026_MRCT_Syn also draw on SynthRAD2025. As the two tasks may hold one patient under two numbers, each case's CT was registered rigidly to SynthRAD2025_HN_MRCT's 20 CTs: they correlate at most 0.53 inside the bodies, where one CT cropped and moved reads 0.95 or more. A Task 1 and a Task 2 patient of one number differ, at most 0.32 over 21 pairs.
- Licence. CC BY-NC 4.0, non-commercial. The archive is given after registration on the challenge's site, so prepare.py reads a local copy.
No method has a result on every case of this dataset yet.
Case by case
Click a score to look at that result: the target image, and over it the method's synthetic image. Underlined scores have their image; for the others you see the case without the result.
About the data
- Test cases
- 24 test patients drawn with seed 2026 by centre (A, B, C, E) in proportion, then 21 development patients, the last of the same seeded order. The pool is the 240 head and neck patients of Task 2's training archive left once SynthRAD2025_HN_CBCTCT's 10 test and 10 development patients are out, since that registration set's public fixed image is this target.
- Truth
- target image as released the patient's CT as the challenge delivers it, registered to the CBCT by the organisers, in Hounsfield units
- Licence
- CC BY-NC 4.0 (centres A, B, C, E)
21 cases for tuning, never tested
HN_2HNC037, HN_2HNE101, HN_2HNC097, HN_2HNE084, HN_2HNA058, HN_2HNB033, HN_2HNC074, HN_2HNE024, HN_2HNA096, HN_2HNB064, HN_2HNC121, HN_2HNE093, HN_2HNA102, HN_2HNB030, HN_2HNC046, HN_2HNE042, HN_2HNA029, HN_2HNB061, HN_2HNC117, HN_2HNE108, HN_2HNA090