SMC file generator

C H A N G E: Scintillation camera parameters

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C H A N G E: Scintillation camera parameters
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1 - Photon energy............................keV:
2 - Source: half-length .....................cm:
3 - Source: half-width .....................cm:
4 - Source: half-height .....................cm:
5 - Phantom: half-length .....................cm:
6 - Phantom: half-width .....................cm:
7 - Phantom: half-height .....................cm:
8 - Crystal: half-length/Radius...............cm:
9 - Crystal: thickness........................cm:
10 - Crystal: half-width..[0=circular].........cm:
11 - Backscattering material: thickness........cm:
12 - Height to detector surface................cm:
13 - Cover: thickness..........................cm:
14 - Phantom type................................:
15 - Source type................................:

Index-1: Photon Energy [keV]

If using a single photon, enter its energy [keV].
If using a radionuclide, enter the center of the energy window [keV]. However, input a negative value in the format "-Energy[keV]".
Example: If you want to set the center of the energy window to 159 keV while using a radionuclide → -159.0
The type of radionuclide is specified in a different item.

Index-2: Source Size (Half of x-direction) [cm]
The shape of the source is specified in Index-15.
If using a voxel-based source, enter half the total length (slice thickness x number of slices).
The number of slices is specified in Index-34.
Example: For an image with 128 slices, if Index-2 is set to 80, the slice thickness will be 2 x 80/128 = 1.25 cm.
However, this can be overridden with the /TH switch.

Index-3: Source Size (Half of y-direction) [cm]
This value is not used for voxel-based sources.
The voxel size of the source map follows the density map (Index-31).
However, this can be overridden with the /PX switch.

Index-4: Source Size (Half of z-direction) [cm]
This value is not used for voxel-based sources.
The voxel size of the source map follows the density map (Index-31).
However, this can be overridden with the /PX switch.

Index-5: Phantom Size (Half of the length in the x-direction) [cm]
If using a voxel-based phantom, enter half the total length (slice thickness x number of slices).
The number of slices is specified in Index-34.
Example: For an image with 128 slices, if Index-5 is set to 80, the slice thickness will be 2 x 80/128 = 1.25 cm.

Index-6: Phantom Size (Half of the length in the y-direction) [cm]
For voxel-based phantoms, this value is not used, and the value from Index-31 is applied.

Index-7: Phantom Size (Half of the length in the z-direction) [cm]
For voxel-based phantoms, this value is not used, and the value from Index-31 is applied.

Index-8: Detector Size (Half of the length in the x-direction) [cm]

Index-9: Scintillator Thickness [cm]

Index-10: Detector Size (Half of the length in the y-direction) [cm]
If Index-10 = 0, the detector will have a cylindrical shape with a radius equal to Index-8.

Index-11: Thickness of the Scatterer Behind the Scintillator (e.g., PMT) [cm]
The simulation will not be performed unless Flag-7 is set to True.
The number of scatterings within the scatterer is defined in simind.ini.

Index-12: Distance from the Origin (0,0,0) to the Lowest Part of the Detector [cm]
The distance to be specified varies depending on whether the collimator (Flag-4) or cover (Flag-10) is in place:
Origin to Collimator / Origin to Cover / Origin to Scintillator.
The thickness of the collimator [cm] is specified in Index-52.
The thickness of the cover [cm] is specified in Index-13.
If using an analytical phantom, entering a negative value will result in a distance equal to the value specified in Index-7 plus the absolute value of Index-12.
Example: Index-7=10.0, Index-12=-5.0 -> Distance 15.0 cm

Index-13: Cover Thickness [cm]
The cover has the same shape and size as the detector.
Energy deposition within the cover is not scored.
The material of the cover is specified in Main-9.
Use Flag-10 to decide whether to simulate the cover.

Index-14: Phantom Type

* Code-based phantoms specify attenuation and activity using tables instead of images.
When specifying a negative value, the file specified in Main-11 will be used.

Index-15: Source Type

※Code-based sources specify attenuation and activity using tables instead of images.
When specifying a negative value, the file specified in Main-12 will be used.

C H A N G E: Scintillation camera parameters

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C H A N G E: Scintillation camera parameters
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16 - Shift source in x-direction...............cm:
17 - Shift source in y-direction...............cm:
18 - Shift source in z-direction...............cm:
19 - Photon direction.........................deg:
20 - Upper window threshold...................keV:
21 - Lower window threshold...................keV:
22 - Energy resolution ...[140 keV]............ %:
23 - Intrinsic resolution [140 keV]............cm:
24 - Emitted photons per decay...................:
25 - Source activity..........................MBq:
26 - Number of photon histories * 1E6............:
27 - keV/channel..............................keV:
28 - Pixel size in simulated image.............cm:
29 - SPECT: No of projections....................:
30 - SPECT: Rotation [0=-360,1=-180,2=360,3=180] :

Index-16: Source Position Shift (x-direction) [cm]:

Index-17: Source Position Shift (y-direction) [cm]:

Index-18: Source Position Shift (z-direction) [cm]:

Index-19: Control of the Photon Emission Solid Angle
2: The solid angle is determined according to three rules. Please refer to the manual for details.
3: Use this setting when penetration is important (e.g., Index-53 = 1) or when photons need to hit the entire detector surface.
0 or less: The polar angle defining the solid angle is calculated based on this value (°). It cannot be less than -90. For example, with -45, the angle is ≤ 45° relative to the detector.

If you enter the same value of -20 for both Index-20 and Index-21, the energy window will be set to Index-1 ± 10%.

Index-20: Energy Window (Upper Limit) [keV] Positive value: Specify in keV. Example: If set to 150, the upper limit is 150 keV.
Negative value: Specify as a relative percentage. Example: If set to -20, the upper limit is Index-1 + (20/2)%

Index-21: Energy Window (Lower Limit) [keV] Positive value: Specify in keV. Example: If set to 130, the lower limit is 130 keV.
Negative value: Specify as a relative percentage. Example: If set to -20, the lower limit is Index-1 - (20/2)%

Index-22: Energy Resolution
Positive value (E): Energy-dependent Gaussian function based on 1/√E
Negative value (E): Gaussian function with a fixed value
0: Defined by the energy resolution text file (Main-14)
To ignore energy resolution (i.e., no blurring), set Flag-12 to False.

Index-23: Intrinsic Spatial Resolution
Blurs the x and y coordinates using a Gaussian function based on the FWHM at 140 keV [cm].
To ignore intrinsic spatial resolution (i.e., no blurring), set Flag-12 to False. (This is an assumption; please verify.)

Index-24: Number of Photons Emitted per Decay
If 'GAMMA = value' is specified in the spectrum file, the number of photons per MBq will be 'value'.
If GAMMA is not defined in the spectrum file, it will be calculated from the total emission ratio of all energies.
If no spectrum file is available, the GAMMA specified in Index-24 will be used.

Index-25: Source Map Activity [MBq]
Since each projection is assumed to have a collection time of 1 second, if you want the projection data values to reflect actual counts, set Index-25 to (collection time T x activity A).
This simply multiplies the original pixel value by (s x MBq), affecting only the apparent numbers, not the underlying data.
It does not determine the number of Monte Carlo calculations (i.e., the number of photons).
For example, if Index-25 = 4, the meaning of the pixel values could be [counts/4s/MBq], [counts/s/4MBq], or [counts/2s/2MBq].
Setting Index-25 = 1 to make the image units [counts/s/MBq], then calculating pixel value x collection time T [s] x activity A [MBq] + Poisson noise, might be easier to understand.

Index-26: Number of Photon Histories Simulated per Projection (x 1,000,000)
For voxel-based simulations, this value is not applicable.
In SPECT imaging, the total number of photon histories is the product of this value and the number of projections (Index-29).
Doubling this value will not change the projection counts or energy spectrum distribution. If Index-25 = 1, the pixel value will be in [counts/s/MBq] (similar to PHITS).
To reduce statistical uncertainty, increase Index-26 as much as possible. If Index-25 = 1, calculate the pixel value x collection time [s] x activity [MBq] + Poisson noise.
If Index-26 is set too low, noise from the Monte Carlo simulation will be added, in addition to Poisson noise.

Index-27: X-Axis of the Energy Spectrum [keV/ch]
The maximum energy on the x-axis of the energy spectrum is given by Index-80 (ch) x Index-27 (keV/ch).
If this maximum energy is lower than the upper limit of the energy window (Index-20), Index-27 [keV/ch] will be automatically adjusted.

Index-28: Pixel Size of the Projection Image [cm/pixel]
By increasing or decreasing this value, the projection image can be zoomed in or out.
The matrix size of the projection image is specified by Index-76 (number of columns) and Index-77 (number of rows).

Index-29: Number of Projections in SPECT
This is relevant only if SPECT imaging (Flag-5) is enabled.

Index-30: SPECT Rotation Settings (Direction & Angle)
This is relevant only if SPECT imaging (Flag-5) is enabled.
Rotation is performed in the yz-plane.
Sign: + for clockwise, - for counterclockwise
Value: Range of rotation angles (the starting angle is specified in Index-41)
Special settings: 0 = 360° counterclockwise, 1 = 180° counterclockwise, 2 = 360° clockwise, 3 = 180° clockwise

C H A N G E: Non-homogeneous phantom and SPECT parameters

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C H A N G E: Non-homogeneous phantom and SPECT parameters
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31 - Pixel size in density images............. cm:
32 - Orientation of the density images ..........:
33 - First image of the set of density images....:
34 - Number of density images....................:
35 - Density limit that defin the border... g/cm3:
36 - Shift density images rel origin (y-dir)...cm:
37 - Shift density images rel origin (z-dir)...cm:
38 - Step size for photon path simulation......cm:
39 - Shift density images rel origin.(x-dir).,,cm:
40 - Density threshold between soft & bone..g/cm3:
41 - SPECT: Starting angle................ degree:
42 - SPECT: Orbital rotation fraction............:
43 - Camera offset : x-direction...............cm:
44 - Camera offset : y-direction...............cm:
45 - Code definitions in generic Zubal phantom...:

Set up the heterogeneous phantom.
The half-length of the phantom in the x-direction is ____ cm, as specified in Index-5.
Each pixel in the density map should be density + 1000. Adding 1000 to the CT image works well.
Index-31: Pixel Size of the Density Map Used to Create the Voxel-based Phantom [cm/pixel] (yz-plane)
This is not the pixel size for scintigraphy, SPECT, or projection images.
The voxel length in the x-direction (slice thickness) is calculated as the length in the body axis direction (x-direction, twice the value of Index-5) divided by the number of slices (Index-34).

Index-32: Cross-section of the Density Map

Index-33: Starting Image for Loading the Density Map
Specify the starting image number for loading the density map (the number of slices is specified in Index-34). Example: 1 -> Start loading from the 1st image.
However, if a negative value is specified, you can specify the number of blocks in units of 512 bytes (for purposes such as header skipping). Example: -2 -> Skip the first 512 bytes and start from the 2nd block.

Index-34: Number of Slices in the Density Map
Specify the number of images to be used for the density map.
Doubling the value in Index-2 and dividing by Index-34 will give the voxel size in the x-direction.
The voxel size in the yz-direction is specified in Index-31.

Index-35: Density to Define the Phantom Boundary [g/cm3]

If the density is lower than the value specified here (threshold), it is determined that the boundary of the phantom has been reached.
If the image contains a lot of noise, there is a possibility of incorrect detection, so it's important to determine this value by considering the mean ± standard deviation of low-density regions within the phantom (such as lung fields or internal gas) and the background (air).
Accurate identification of the phantom boundary is crucial, as errors can reduce the accuracy of attenuation correction and automatic alignment.

Index-36: Phantom Translation (y-direction) [cm]

Index-37: Phantom Translation (z-direction) [cm]

Index-39: Phantom Translation (x-direction) [cm]

Index-38: Step Size [cm] Used for Ray-Tracing Photon Paths Through the Density Map
The specified value should be smaller than the pixel size of the density map (Index-31).
However, since the calculation time depends on this step size, avoid setting it too small.

Index-40: Density [g/cm³] to Switch from the Soft Tissue Cross-Section File (Main-7) to the Bone Cross-Section File (Main-8)
If set to 0, the default value defined in simind.ini will be used.

Index-41: Starting Angle of the Detector in SPECT Imaging [°]
This is relevant only if SPECT imaging (Flag-5) is enabled.
Positive values: Clockwise
Negative values: Counterclockwise
0: Angle centered on the z-axis
The range of rotation is specified in Index-30.

$Orbital rotation fraction$

Index-42: Orbital Rotation Fraction to Control Non-circular Orbits of the Detector in SPECT Imaging
This is relevant only if SPECT imaging (Flag-5) is enabled.
Positive values:
Specify the distance from the origin in the y-direction to the closest part of the detector relative to Index-12 (distance from the origin to the closest part of the detector in the z-direction).
Example: If Index-12 = 10, and Index-42 = 1.5, the maximum radius of rotation on the y-axis will be 15 cm.
Example: If Index-12 = 10, and Index-42 = 1, the orbit will be a circle with a radius of 10 cm.
Negative values:
Automatic proximity mode. For example, if set to -5, the detector will rotate to maintain a 5 cm distance between the phantom surface and the detector surface.
The actual distances used for rotation in each direction are output to the log file (*.cor).
It is important that Index-35 is set appropriately and that the phantom boundary is correctly recognized.
Index-42 cannot be set to 0.

$Orbital rotation fraction$

Index-43: Detector Translation (x-direction) [cm]

Index-44: Detector Translation (y-direction) [cm]

Index-45: Code-based Phantom Specification
This input is required when selecting a code-based phantom (Index-14 & Index-15 = -1, -5, or -6).
The phantom.zub file contains sections like the one shown below. Enter the corresponding value.
You can also add new sections if the format is followed.
Supported phantoms:
8-bit -> Index-14 & Index-15 = -5
32-bit -> Index-14 & Index-15 = -6
vox_man1.dat -> Index-14 & Index-15 = -1

C H A N G E: Collimator parameters si-lehr

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C H A N G E: Collimator parameters XX-XXXX
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46 - Hole size X.............................. cm:
47 - Hole size Y.............................. cm:
48 - Distance between holes in x-direction.....cm:
49 - Distance between holes in y-direction.....cm:
50 - Shif center hole in x-direction...........cm:
51 - Shif center hole in y-direction...........cm:
52 - Collimator thickness......................cm:
53 - Collimator routine .........................:
54 - Hole shape:2=Circular,3=Hex,4=Rectangular...:
55 - Type: 0=PA,1=PI,2=CO,3=FB,4=DV,5=SH ........:
56 - Collimator-dependent variable 1. :
57 - Collimator-dependent variable 2. :
58 - Collimator-dependent variable 3. :
59 - Random collimator movement (0=no)...........:
60 - Collimator-dependent variable 4. :

*Index-46 to Index-69 are relevant only if collimator simulation is enabled in Flag-4.

Collimator Selection
1: Use a commercial collimator. 2: Enter collimator information manually.

Index-46: Collimator Size (x-direction) [cm]
For hexagonal shapes, specify the hole diameter as the diameter of the inscribed circle or the distance between the flat sides.

Index-47: Collimator Size (y-direction) [cm]
Circular: Index-46 = Index-47
Hexagonal: Index-46 × (2/√3)

Index-48: Distance Between Collimator Holes (x-direction) [cm]
This refers to the thickness of the septa.

Index-49: Distance Between Collimator Holes (y-direction) [cm]
Circular: Index-48 = Index-49
Hexagonal: (Index-48 x (√3/2)) + Index-46/√3 + (Index-48 x (√3/2))

Index-50: Shift in the x-direction from the center to the adjacent hole [cm]
This parameter only applies to circular or hexagonal collimator holes (Index-54 = 2 or 3).
It is calculated as (Index-46 + Index-48)/2.

Index-51: Shift in the y-direction from the center to the adjacent hole [cm]
This parameter only applies to circular or hexagonal collimator holes (Index-54 = 2 or 3).
It is calculated as (Index-47 + Index-49)/2.

Index-52: Collimator Thickness (z-direction) [cm]

Index-53: Please select the collimator type:
For the differences between the types, refer to the following link: https://github.com/lukepolson/SIMIND-Tutorials/blob/master/tutorial4/analysis.ipynb
Index-53 = 0 is the Analytical model. There is little difference when the gamma-ray energy is low.

Index-54: Geometric Shape of the Collimator Holes:

Index-55: Geometric Shape of the Collimator:

Index-56: Collimator Dependent Variable 1 [cm]
If Index-55 = 0, this value represents the gap between the collimator and the detector.
If Index-55 = 1, this value represents the gap between the pinhole and the detector.
*The manual states that this value represents the gap between the collimator and the cover. Please verify which is correct.

Index-57: Collimator Dependent Variable 2 [cm]
If Index-55 = 2, 3, or 4 and Index-53 = 0, this value represents the focal length.

Index-58: Collimator Dependent Variable 3 (Reserved for Future Releases)

Index-59: Removal of Collimator Hole Pattern Shadows in the Image
For parallel hole collimators (Index-55 = 1), this setting removes the hole patterns observed in the image by moving the collimator.

Index-60: Collimator Dependent Variable 4 (Reserved for Future Releases)

C H A N G E: Imaging parameters and other settings

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C H A N G E: Imaging parameters and other settings
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76 - Matrix size image I ........................:
77 - Matrix size image J ........................:
78 - Matrix size density map I ..................:
79 - Matrix size source map I ..................:
80 - Energy spectra channels ....................:
81 - Matrix size Density map J ..................:
82 - Matrix size source map J ..................:
83 - Cut-off energy to terminate photon history..:
84 - Scoring routine ............................:
85 - CSV file content ...........................:

Index-76: Number of Columns in the Projection Image
The first column is 1.

Index-77: Number of Rows in the Projection Image
The first row is 1.

Index-78: Matrix Size in the I-direction (Columns) of the Density Map
This refers to the number of pixels (e.g., 128, 256), not the dimensions of the pixels [cm].

Index-81: Matrix Size in the J-direction (Rows) of the Density Map
This refers to the number of pixels (e.g., 128, 256), not the dimensions of the pixels [cm].
If Index-81 is set to 0, it will be set to the same size as Index-78.

Index-79: Matrix Size in the I-direction (Columns) of the Source Map
However, this only applies to Zubal phantoms (when Index-14 and Index-15 are -2, -3, or -4):
-2: 128 x 128
-3: 256 x 256
-4: 192 x 96

Index-82: Matrix Size in the J-direction (Rows) of the Source Map
This refers to the number of pixels (e.g., 128, 256), not the dimensions of the pixels [cm].
If Index-82 is set to 0, it will be set to the same size as Index-79.

Index-80: Number of Channels in the Energy Spectrum Distribution
The maximum energy of the energy spectrum distribution (x-axis) [keV] = Index-80 [channels] x Index-27 [keV/channel]

Index-83: Lower Energy Threshold for Scatter Simulation Cut-off
Photons with energy below the lower energy threshold will not be calculated.
The lower energy threshold is determined by Index-1 and Index-21.
Positive value: The cut-off is the value entered here [keV]. Example: 30 -> 30 keV
Negative value: The cut-off is the lower energy window minus the value entered here. Example: -30 -> Lower energy window - Index-83 (30)
If Index-84 = 1 and a negative cut-off energy is specified, the lowest value of the energy window defined in the *.win file will be used as the cut-off.

Index-84: Scoring Routine

Index-85: Output Specific Results to CSV File
Please refer to the manual for details.
Specify a value between 0 and 5.
0: No output
1: 'ResFile','ComReg','FulReg', 'PilReg','Foto1','Compt1','Effici(W)','SD','Effici(D)','Cps/MBq','Cpm/mCi','Peak/C1','Peak/C2','Peak/Tot', 'FWHM','FWTM'
2: 'ResFile','ScattPrim', 'ScattTot','ScatterOrder from 1 to ISCUT','FWHM','FWTM'
3: 'File','HV0','HoleDiam','CollZ','CollDep1','CollDep2','CollDep3','CollDep4','CpsMBq', 'Geom (D)','Geom (W)','Pen (D)','Pen (W)','Scatt (D)','Scatt (W)'
4: Scatter/Total (W), ScatterWeight(W), PrimaryWeight(W) for each projection angle. A new file is always created with this option.
5: The activities and concentrations for the voxel-based phantom are written.
*FWHM and FWTM results are only applicable when the point source is positioned at the origin (0,0,0).

The file will be output as `output.csv`. However, you can change the file name as shown below. Example: `"simind [input] [output]/85:1 csvname"` -> The file will be output as `csvname.csv`.

C H A N G E: Solid-State detector settings - I

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C H A N G E: Solid-State detector settings - I
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91 - Voltage...................................V:
92 - Mobility life (electrons)........10-3 cm2/V:
93 - Mobility life (holes) ...........10-3 cm2/V:
94 - Contact pad size ...................... cm:
95 - Anode element pitch .................... cm:
96 - Exponential decay constant (tau)...........:
97 - Components in Hecht formula (e=0, e+h=1)...:
98 - Energy resolution model ...................:
99 - Cloud mobility.............................:
100 - Detector Array Size I ...............pixels:
101 - Detector Array Size J ...............pixels:

In this version of SIMIND, it is possible to perform simulations of solid-state Cadmium Zinc Telluride (CZT).
Index-91: Voltage Between Anode and Cathode [V]
A typical value is 600 [V].

Index-92: Electron Mobility-Lifetime Product [0.001*cm2/V]
A typical value is 5.

Index-93: Mobility life of holes [0.001*cm2/V]
The typical value is 0.4.

Index-94: Anode contact pad [cm]
The pad is assumed to be square.
The typical value is 0.186.

Index-95: Detector element spacing [cm]
Index-94 + gap
The typical value is 0.246.

Index-96: Exponential decay term for simplifying Ramo's theorem of induced charge

Index-97: Hecht formula for simulating signal loss due to recombination.
0: Simulate electrons only
1: Use the Hecht formula for both electrons and holes

Index-98: Different energy resolution models
0: Model based on √E
-1: Chen's energy resolution model
-2: Chen model + Index-22
Other: Energy resolution defined by the *.erf file (Index-22 set to 0 or use the /EF switch)

Index-99: Diffusion constant
The lateral movement (drift) of charged particles as they move toward the anode is modeled as a Gaussian function. Please specify the diffusion constant.
The typical value is 0.225.

Index-100: Number of pixels in the I direction of the detector
It does not need to match the number of pixels in the image.

Index-101: Number of pixels in the J direction of the detector
It does not need to match the number of pixels in the image.

Please confirm that all items are selected as intended, then download from below.
I have reviewed all items

This page is a beta version. There may be bugs.
Please compare and verify with the files created by change.exe before use.

Pre-input Checklist

C H A N G E: Simulation flags

Main page for SIMIND version V8.0

C H A N G E: Scintillation camera parameters

C H A N G E: Scintillation camera parameters

C H A N G E: Non-homogeneous phantom and SPECT parameters

C H A N G E: Collimator parameters si-lehr

C H A N G E: Imaging parameters and other settings

C H A N G E: Solid-State detector settings - I

This page is a beta version. There may be bugs.Please compare and verify with the files created by change.exe before use.

Pre-input Checklist

C H A N G E: Simulation flags

Main page for SIMIND version V8.0

C H A N G E: Scintillation camera parameters

C H A N G E: Scintillation camera parameters

C H A N G E: Non-homogeneous phantom and SPECT parameters

C H A N G E: Collimator parameters si-lehr

C H A N G E: Imaging parameters and other settings

C H A N G E: Solid-State detector settings - I

This page is a beta version. There may be bugs.
Please compare and verify with the files created by change.exe before use.