Rebuilt plot_sinogram_profiles.py for 4D tof data

documentation/release_6.3.htm

@@ -125,6 +125,15 @@ <h4>C++ tests</h4>
 
 <h4>recon_test_pack</h4>
 
+<h3>Changes to examples</h3>
+<uk>
+  <li>
+    Python example <code>plot_sinogram_profiles.py</code> has been renamed to <code>plot_projdata_profiles.py</code>
+    and generalised to work with TOF dimensions etc. A small <code>pytest</code> has been added as well.
+    <a href=https://github.com/UCL/STIR/pull/1370>PR #1370</a>
+  </li>
+</ul>
+
 </body>
 
 </html>

examples/python/plot_projdata_profiles.py

@@ -0,0 +1,234 @@
+# Demo to plot the profile of projection data using STIR
+# To run in "normal" Python, you would type the following in the command line
+#  execfile('plot_projdata_profiles.py')
+# In ipython, you can use
+#  %run plot_projdata_profiles.py
+# Or of course
+#  import plot_projdata_profiles
+
+# Copyright 2021 University College London
+# Copyright 2024 Prescient Imaging
+
+# Authors: Robert Twyman
+
+# This file is part of STIR.
+# SPDX-License-Identifier: Apache-2.0
+# See STIR/LICENSE.txt for details
+
+import argparse
+import sys
+
+import matplotlib.pyplot as plt
+import numpy as np
+
+import stir
+import stirextra
+
+PROJDATA_DIM_MAP = {
+    0: "TOF",
+    1: "Axial Segment",
+    2: "View",
+    3: "Tangential"
+}
+
+
+def get_projdata_from_file_as_numpy(filename: str) -> np.ndarray | None:
+    """
+    Load a Projdata file and convert it to a NumPy array.
+    Args:
+        filename: The filename of the Projdata file to load.
+    Returns:
+        result: The NumPy array.
+    """
+    try:
+        projdata: stir.ProjData = stir.ProjData.read_from_file(filename)
+    except Exception as e:
+        print(f"Error reading file {filename}: {e}")
+        return None
+
+    try:
+        return stirextra.to_numpy(projdata)
+    except Exception as e:
+        print(f"Error converting to numpy: {e}")
+        return None
+
+
+def get_projection_data_as_array(f: str | stir.ProjData) -> np.ndarray | None:
+    """
+    Get the projection data from a file or object.
+    Args:
+        f: The file name or object to get the projection data from.
+    Returns:
+        result: The projection data as a NumPy array.
+    """
+    # Get the input data from a file or object
+    if isinstance(f, str):
+        print(f"Handling:\n\t{f}")
+        return get_projdata_from_file_as_numpy(f)
+
+    elif isinstance(f, stir.ProjData):
+        try:
+            return stirextra.to_numpy(f)
+        except AttributeError as e:
+            print(f"AttributeError converting to projdata to numpy.\nError message{e}")
+            return None
+
+    else:
+        print(f"Unknown type for {f=}")
+        return None
+
+
+def compress_and_extract_1d_from_nd_array(data: np.ndarray,
+                                          display_axis: int,
+                                          axes_indices: list[int | None] | None = None
+                                          ) -> np.ndarray:
+    """
+    Generate a 1D array from an n-dimensional NumPy array based on specified parameters.
+    The display is the axis to be extracted.
+    The axes_indices is a list of indices to extract from each dimension.
+    If the index is None, the entire dimension is summed.
+    If the index is not None, the data is taken from that index.
+    Args:
+        data: The n-dimensional NumPy array.
+        display_axis: The index of the dimension to be treated as the horizontal component.
+        axes_indices: A list of indices to extract from each dimension.
+            If None, all indices, except the display axis, are summed.
+    Returns:
+        result: The 1D NumPy array.
+    Exceptions:
+        ValueError: If the data is not at least 2D.
+        ValueError: If the number of axes indices does not match the number of dimensions.
+        ValueError: If the indices are out of bounds.
+    """
+    if data.ndim < 2:
+        raise ValueError(f"Data must have at least 2 dimensions, not {data.ndim}D")
+
+    if axes_indices is None:
+        axes_indices = [None] * data.ndim
+    if not len(axes_indices) == data.ndim:
+        raise ValueError(
+            f"Number of axes indices ({len(axes_indices)}) must match the number of dimensions ({data.ndim})")
+
+    working_axis = 0
+    # Check if indices are within valid range for all dimensions
+    for data_axis, index in enumerate(axes_indices):
+        if index is not None and not np.all(np.logical_and(index >= 0, index < data.shape[data_axis])):
+            raise ValueError(f"Indices for axis {data_axis} are out of bounds. {index=}, {data.shape[data_axis]=}")
+
+    for data_axis in range(data.ndim):
+        if display_axis == data_axis:
+            working_axis += 1
+        elif axes_indices[data_axis] is None:
+            data = np.sum(data, axis=working_axis)
+        else:
+            data = np.take(data, axes_indices[data_axis], axis=working_axis)
+    return data
+
+
+def plot_projdata_profiles(projection_data_list: list[stir.ProjData] | list[str],
+                           display_axis: int = 3,
+                           data_indices: list[int | None] | None = None,
+                           ) -> None:
+    """
+    Plots the profiles of the projection data.
+    Compress (via sum) and extract a 1D array from a 4D array of projection data for each element of the list.
+    Args:
+        projection_data_list: list of projection data file names or stir.ProjData objects to load and plot.
+        display_axis: The horizontal component of the projection data to plot.
+        data_indices: The indices to extract from the projection data (None indices are summed).
+    Returns:
+        None
+    """
+
+    plt.figure()
+    ax = plt.subplot(111)
+
+    for f in projection_data_list:
+        if isinstance(f, str):
+            label = f
+        else:
+            label = ""
+
+        projdata_npy = get_projection_data_as_array(f)
+        if projdata_npy is None:
+            continue
+
+        # Generate the 1D array
+        try:
+            plot_data = compress_and_extract_1d_from_nd_array(projdata_npy, display_axis, data_indices)
+        except ValueError as e:
+            print(f"Error generating 1D array object.\nError message: {e}")
+            continue
+
+        plt.plot(plot_data, label=label)
+
+    if len(plt.gca().get_lines()) == 0:
+        print("Something went wrong! No data to plot.")
+        return
+
+    # Identify sum and extraction axes
+    sum_axis = [i for i, x in enumerate(data_indices) if x is None and i != display_axis]
+    index_axis = [i for i, x in enumerate(data_indices) if x is not None and i != display_axis]
+
+    # Extract labels and values for sum and extraction axes
+    sum_axis_labels = [PROJDATA_DIM_MAP[i] for i in sum_axis]
+    extraction_axis_labels = [PROJDATA_DIM_MAP[i] for i in index_axis]
+    index_values = [data_indices[i] for i in index_axis]
+
+    # Plot title
+    plt.title(f"Summing {sum_axis_labels} axis and extracting {extraction_axis_labels} with values {index_values}")
+    plt.xlabel(f"{PROJDATA_DIM_MAP[display_axis]}")
+    ax.legend()
+    plt.show()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(sys.argv[0])
+    parser.description = ("This script loads, sums axis' and plots profiles over input projection data files."
+                          "The default is to sum over all components, except the display axis."
+                          "The indices used are array based, not STIR offset based.")
+    parser.add_argument('filenames',
+                        nargs='*',
+                        help='Projection data file names to show, can handle multiple.')
+    parser.add_argument('--display_axis',
+                        dest="display_axis",
+                        type=int,
+                        default=3,
+                        help='The horizontal component of the projection data to plot.'
+                             'The default is -1 indicating a sum over all components. '
+                             '0: TOF, 1: axial (and segment), 2: view, 3: tangential.')
+    parser.add_argument('--tof',
+                        dest="tof",
+                        type=int,
+                        default=None,
+                        help='The TOF value of the projection data to plot.'
+                             'The default is to sum over all TOF values.')
+    parser.add_argument('--axial_segment',
+                        dest="axial_segment",
+                        type=int,
+                        default=None,
+                        help='The axial segment number of the projection data to plot.'
+                             'The default is to sum over all axial segments.')
+    parser.add_argument('--view',
+                        dest="view",
+                        type=int,
+                        default=None,
+                        help='The view of the projection data to plot.'
+                             'The default is to sum over all views.')
+    parser.add_argument('--tangential_pos',
+                        dest="tangential",
+                        type=int,
+                        default=None,
+                        help='The tangential position of the projection data to plot.'
+                             'The default is to sum over all tangential positions.')
+
+    args = parser.parse_args()
+
+    if len(args.filenames) < 1:
+        parser.print_help()
+        exit(0)
+
+    plot_projdata_profiles(projection_data_list=args.filenames,
+                           display_axis=args.display_axis,
+                           data_indices=[args.tof, args.axial_segment, args.view, args.tangential]
+                           )