image data from Magnetom XA30 read errors with latest stable and dev versions

[mlewis1973]

surprisingly this issue exists only for twixtools>=0.24
reads work fine with earlier verisons <=0.23 or gt-twixtools fork, as well as latest mapVBVD with Matlab
(haven't tried pymapvbvd)

read_twix(parse_data=False) correctly returns headers.....
read_twix(parse_data=True) gives unpack error

twix_data = read_twix(filename, verbose=True, parse_data=True)
Software version: VD/VE (!?)

Scan 0
0%| | 0.00/38.1M [00:00<?, ?B/s]unknown magic key: 0x1010000
unknown magic key: 0x1020000
unknown magic key: 0x1030000
unknown magic key: 0x1040000
unknown magic key: 0x1050000
unknown magic key: 0x1060000
unknown magic key: 0x1070000
unknown magic key: 0x1080000
unknown magic key: 0x1ff0000
Traceback (most recent call last):
File "", line 1, in
File "/opt/anaconda3/envs/TWIX2/lib/python3.9/site-packages/twixtools/twixtools.py", line 200, in read_twix
pmu = PMU(out[-1]['mdb'], helpers.get_syngo_version(out[-1]['hdr']))
File "/opt/anaconda3/envs/TWIX2/lib/python3.9/site-packages/twixtools/pmu.py", line 238, in init
block = PMUblockVA(seqdata.data, self.unknown_pmu_magic)
File "/opt/anaconda3/envs/TWIX2/lib/python3.9/site-packages/twixtools/pmu.py", line 142, in init
period, = struct.unpack('I', data[i:i+4])
struct.error: unpack requires a buffer of 4 bytes

[pehses]

Ok, this has something to do with the PMU data. The PMU format for XA30 seems to be different from what is expected. For a quick fix you could just disable the parsing of the pmu data by adding "parse_pmu=False" as an argument to your read_twix call.

Do you have a small .dat file that I can use for testing? This is probably a very quick fix, I just have to find out which of the different pmu format versions XA30 is using. From your error message it looks to me that it is actually using the old pmu layout of the VE versions, so it's only line 234 that would need to be changed (so that "PMUblock" is used instead of "PMUblockVA").