fidoptSynthRAD2025, MR to CT, head and neck
Head and neck MR of one patient and the CT to synthesise from it, the CT brought onto the MR's grid by the challenge (SynthRAD2025, Task 1).
13 test caseshead and necksource MR, target CTresearch only
Read before comparing (6)
- Case. The challenge's pair as delivered, copied byte for byte from the organisers' training archive synthRAD2025_Task1_Train.zip: the MR, the CT the organisers registered onto its grid and their body mask.
- Access. The archive is given only after registration on the challenge's site, so prepare.py reads a copy kept on the reference machine.
- Mask. The challenge's body mask: the synthetic image is scored inside it, as the challenge scores it.
- Alignment. How the organisers registered the CT to the MR bounds how far a perfect synthesis can match it: what that registration left misaligned counts as error for every method.
- Baseline. Inside the mask on the 13 test cases, with KonfAI's criteria at CT's range of 4095, a constant at the target's median scores an MAE of 314 (251 to 411) HU, a PSNR of 18.2 (16.8 to 20.1) dB and an SSIM of 0.24 (0.07 to 0.35). The MR itself taken as the CT scores 456 (325 to 955) HU, 16.9 (12.0 to 19.3) dB and 0.03 (-0.10 to 0.29), better than the constant on none of the 13.
- Overlap. Besides SynthRAD2025_HN_MRCT, whose 20 patients are out, the corpus's other Task 1 sets hold the thorax and abdomen. The provider's two tasks may hold one patient under two numbers, so each drawn case's CT was registered rigidly to every CT of SynthRAD2025_HN_CBCTCT (20) and SynthRAD2025_HN_CBCTCT_Syn (45) and correlated inside the bodies: at most 0.53, where one CT cropped and moved reads 0.95 or more.
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
- 13 test patients drawn with seed 2026 by centre (A, C) in proportion, after 12 development patients were taken, each stratum in proportion, from the end of the same seeded order. The pool is 136 of the 156 head and neck patients of the Task 1 training archive, once SynthRAD2025_HN_MRCT's 10 test and 10 development patients are out, since its public fixed image is this target.
- Truth
- target image as released the patient's CT as the challenge delivers it, registered to the MR by the organisers, in Hounsfield units
- Licence
- CC BY-NC 4.0 (centres A, B, C, E)
12 cases for tuning, never tested
HN_1HNA067, HN_1HNA049, HN_1HNA108, HN_1HNA115, HN_1HNA086, HN_1HNA015, HN_1HNA116, HN_1HNC076, HN_1HNC088, HN_1HNC117, HN_1HNC037, HN_1HNC067