Quote from emintavlayan on March 25, 2026, 9:20 am

Hi all,

I am getting error importing original Varian Phase space files:

1. Key phrase:$RECORD_CONSTANT: vals:
2. Error: the calculated record length does not match the one declared in the header !

any ideas?!

//TrueBeam_06E_00.IAEAheader :

$IAEA_INDEX:
00

$TITLE:
Varian TrueBeam 06E beam; created with VirtuaLinac (Sept. 24, 2014)

$FILE_TYPE:
0

$CHECKSUM:
986120961

$RECORD_CONTENTS:
1 // X is stored ?
1 // Y is stored ?
0 // Z is stored ?
1 // U is stored ?
1 // V is stored ?
0 // W is stored ?
0 // Weight is stored ?
0 // Extra floats stored ?
0 // Extra longs stored ?

$RECORD_CONSTANT:
26.7 // Constant Z

$RECORD_LENGTH:
21

$BYTE_ORDER:
1234

$ORIG_HISTORIES:
65000000

$PARTICLES:
46958141

$PHOTONS:
9905535

$ELECTRONS:
37050269

$POSITRONS:
2337

$PROTONS:
0

$NEUTRONS:
0

$TRANSPORT_PARAMETERS:
Physics list: emstandard_opt4
Interaction data: G4EMLOW6.35
Range cut (photon) : 0.01 mm
Range cut (electron): 0.01 mm
Range cut (positron): 0.01 mm

$MACHINE_TYPE:
x86_64

$MONTE_CARLO_CODE_VERSION:
Name: geant4-10-00-patch-01 [MT] (28-February-2014)

$GLOBAL_PHOTON_ENERGY_CUTOFF:
0.0

$GLOBAL_PARTICLE_ENERGY_CUTOFF:
0.0

$COORDINATE_SYSTEM_DESCRIPTION:
IEC 61217. Z is beam axis; X is crossplane; Y is inplane.
Positive Z is opposite beam direction and Z=0 is at isocenter
(1000 mm from virtual source). For consistency with photon files,
"Constant Z" parameter above is the distance from the photon virtual
source (i.e. particles are 73.3 cm from isoplane.)

$MD5SUM:
71642220aa1e45d3dad341e41f356d32

$BEAM_NAME:
Electron beam with foil 1 name: 6E and foil 2 name: 6E
Foil 1 thickness (relative to nominal): 1.07
Thickness of metal coating on ion chamber windows (relative to nominal): 0.8

$FIELD_SIZE:
Jaws/mlc not included in simulation.

$NOMINAL_SSD:

$MC_INPUT_FILENAME:

$VARIANCE_REDUCTION_TECHNIQUES:

$INITIAL_SOURCE_DESCRIPTION:
Random incident beam. Mean energy of incident electrons: 6.84 MeV.
Energy spectrum is a Gaussian with sigma 0.6 MeV.
Spot is a Gaussian with sigma: 0.7 mm (X), 0.7 mm (Y).
Spot position: 0 mm (X), 0 mm (Y).
Beam divergence: 0 deg (X), 0 deg (Y);
Beam angle: 0 deg (X), 0 deg (Y).

$PUBLISHED_REFERENCE:

$AUTHORS:
Daren Sawkey <daren.sawkey@varian.com>, <montecarloresearch@varian.com>

$INSTITUTION:
Varian Medical Systems, Inc., 3100 Hansen Way, Palo Alto CA 94304 USA

$LINK_VALIDATION:
http://myvarian.com/montecarlo

$ADDITIONAL_NOTES:
Format of phase space file:
Type (1 byte); Energy (4); X (4); Y (4); MomDirX (4); MomDirY (4) Weight (if recorded) (4);
Total of 21 bytes per particle.
Units are MeV for energy, cm for X and Y.
Types are 1 (photon), 2 (electron), 3 (positron)
W is not recorded. Only particles travelling toward isocenter recorded.
Original history flag is a negative energy.

$STATISTICAL_INFORMATION_PARTICLES:
// Weight Wmin Wmax <E> Emin Emax Particle
9905535 1.00000 1.00000 0.738188 0.000990 8.657561 PHOTONS
37050269 1.00000 1.00000 5.594001 0.000000 9.370461 ELECTRONS
2337 1.00000 1.00000 1.464628 0.186184 4.712856 POSITRONS

$STATISTICAL_INFORMATION_GEOMETRY:
direction min max
x -6.5000 6.5000
y -6.5000 6.5000