diff --git a/docs/outputs.rst b/docs/outputs.rst
index da218755..7af6efc8 100644
--- a/docs/outputs.rst
+++ b/docs/outputs.rst
@@ -309,7 +309,7 @@ from an anatomical segmentation. The resulting table has ``FrameTimesStart`` and
 
   sub-<subject_label>/
     pet/
-      sub-<subject_label>_[specifiers]_seg-<seg>_desc-preproc_timeseries.tsv
+      sub-<subject_label>_[specifiers]_seg-<seg>_desc-preproc_tacs.tsv
 
 The ``desc-preproc`` entity indicates that the curves were derived from the
 preprocessed PET series.
@@ -323,7 +323,7 @@ table containing the mean uptake within that region::
 
   sub-<subject_label>/
     pet/
-      sub-<subject_label>_[specifiers]_seg-<seg>_ref-<ref>_desc-preproc_timeseries.tsv
+      sub-<subject_label>_[specifiers]_seg-<seg>_ref-<ref>_desc-preproc_tacs.tsv
 
 The ``ref`` entity captures the reference region identifier provided via the
 :ref:`CLI options <cli_refmask>` ``--ref-mask-name`` and ``--ref-mask-index``.
diff --git a/petprep/data/nipreps.json b/petprep/data/nipreps.json
index c95fb92b..6de1c82e 100644
--- a/petprep/data/nipreps.json
+++ b/petprep/data/nipreps.json
@@ -181,13 +181,13 @@
     "sub-{subject}[/ses-{session}]/{datatype<perf>|perf}/sub-{subject}[_ses-{session}][_task-{task}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_space-{space}][_atlas-{atlas}][_cohort-{cohort}][_desc-{desc}]_{suffix<timeseries>}{extension<.json|.tsv>|.tsv}",
     "sub-{subject}[/ses-{session}]/{datatype<perf>|perf}/sub-{subject}[_ses-{session}][_task-{task}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_space-{space}][_atlas-{atlas}][_cohort-{cohort}][_desc-{desc}]_{suffix<asl|aslref|att|cbf|coverage|mask>}{extension<.nii|.nii.gz|.json|.tsv>|.tsv}",
     "sub-{subject}[/ses-{session}]/{datatype<fmap>|fmap}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_dir-{direction}][_run-{run}][_part-{part}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_fmapid-{fmapid}][_desc-{desc}]_{suffix<fieldmap>}{extension<.nii|.nii.gz|.json>|.nii.gz}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_desc-{desc}]_{suffix<pet|petref>}{extension<.nii|.nii.gz|.json>|.nii.gz}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_run-{run}][_hemi-{hemi<L|R>}]_from-{from}_to-{to}_mode-{mode<image|points>|image}_{suffix<xfm>|xfm}{extension<.txt|.h5>}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_run-{run}]_hemi-{hemi<L|R>}[_space-{space}][_cohort-{cohort}][_den-{density}][_desc-{desc}]_{suffix<white|smoothwm|pial|midthickness|inflated|vinflated|sphere|flat|sulc|curv|thickness>}{extension<.surf.gii|.shape.gii>}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_den-{density}][_desc-{desc}]_{suffix<sulc|curv|thickness>}{extension<.dscalar.nii|.json>}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}]_desc-{desc}_{suffix<mask>|mask}{extension<.nii|.nii.gz|.json>|.nii.gz}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}]_label-{label}[_desc-{desc}]_{suffix<probseg>|probseg}{extension<.nii|.nii.gz|.json>|.nii.gz}",
-    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_trc-{tracer}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_part-{part}][_space-{space}][_atlas-{atlas}][_cohort-{cohort}][_desc-{desc}]_{suffix<timeseries|regressors>|timeseries}{extension<.json|.tsv>|.tsv}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_desc-{desc}]_{suffix<pet|petref>}{extension<.nii|.nii.gz|.json>|.nii.gz}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_hemi-{hemi<L|R>}]_from-{from}_to-{to}_mode-{mode<image|points>|image}_{suffix<xfm>|xfm}{extension<.txt|.h5>}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}]_hemi-{hemi<L|R>}[_space-{space}][_cohort-{cohort}][_den-{density}][_desc-{desc}]_{suffix<white|smoothwm|pial|midthickness|inflated|vinflated|sphere|flat|sulc|curv|thickness>}{extension<.surf.gii|.shape.gii>}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_den-{density}][_desc-{desc}]_{suffix<sulc|curv|thickness>}{extension<.dscalar.nii|.json>}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}]_desc-{desc}_{suffix<mask>|mask}{extension<.nii|.nii.gz|.json>|.nii.gz}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}]_label-{label}[_desc-{desc}]_{suffix<probseg>|probseg}{extension<.nii|.nii.gz|.json>|.nii.gz}",
+    "sub-{subject}[/ses-{session}]/{datatype<pet>|pet}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_part-{part}][_space-{space}][_atlas-{atlas}][_cohort-{cohort}][_desc-{desc}]_{suffix<timeseries|regressors|tacs>|timeseries}{extension<.json|.tsv>|.tsv}",
     "sub-{subject}/{datatype<figures>}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_desc-{desc}]_{suffix<T1w|T2w|T1rho|T1map|T2map|T2star|FLAIR|FLASH|PDmap|PD|PDT2|inplaneT[12]|angio|dseg|mask|T2starw|MTw|TSE|pet>}{extension<.html|.svg>|.svg}",
     "sub-{subject}/{datatype<figures>}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_fmapid-{fmapid}][_desc-{desc}]_{suffix<fieldmap>}{extension<.html|.svg>|.svg}",
     "sub-{subject}/{datatype<figures>}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_echo-{echo}][_part-{part}][_space-{space}][_cohort-{cohort}][_desc-{desc}]_{suffix<dwi|epi|epiref|pet>}{extension<.html|.svg>|.svg}",
diff --git a/petprep/interfaces/tacs.py b/petprep/interfaces/tacs.py
index fac26656..19fb71d3 100644
--- a/petprep/interfaces/tacs.py
+++ b/petprep/interfaces/tacs.py
@@ -80,7 +80,7 @@ def _run_interface(self, runtime):
 
         out_file = fname_presuffix(
             self.inputs.in_file,
-            suffix='_timeseries.tsv',
+            suffix='_tacs.tsv',
             newpath=runtime.cwd,
             use_ext=False,
         )
@@ -138,7 +138,7 @@ def _run_interface(self, runtime):
 
         out_file = fname_presuffix(
             self.inputs.in_file,
-            suffix='_timeseries.tsv',
+            suffix='_tacs.tsv',
             newpath=runtime.cwd,
             use_ext=False,
         )
diff --git a/petprep/interfaces/tests/test_tacs.py b/petprep/interfaces/tests/test_tacs.py
index 61f97d42..1276627a 100644
--- a/petprep/interfaces/tests/test_tacs.py
+++ b/petprep/interfaces/tests/test_tacs.py
@@ -164,7 +164,7 @@ def test_tacs_workflow(tmp_path):
         inputs = pickle.load(f)
 
     assert inputs['in_file'] == str(resampled_pet)
-    assert Path(tmp_path / 'pet_tacs_wf' / 'tac' / 'pet_resampled_timeseries.tsv').exists()
+    assert Path(tmp_path / 'pet_tacs_wf' / 'tac' / 'pet_resampled_tacs.tsv').exists()
 
 
 def test_ExtractRefTAC(tmp_path):
diff --git a/petprep/utils/bids.py b/petprep/utils/bids.py
index 440177fc..97bc8cff 100644
--- a/petprep/utils/bids.py
+++ b/petprep/utils/bids.py
@@ -103,6 +103,7 @@ def write_bidsignore(deriv_dir):
         '*_pet.pet.gii',
         '*_mixing.tsv',
         '*_timeseries.tsv',
+        '*_tacs.tsv',
     )
     ignore_file = Path(deriv_dir) / '.bidsignore'
 
diff --git a/petprep/workflows/pet/base.py b/petprep/workflows/pet/base.py
index 2a1b63a8..e10fc508 100644
--- a/petprep/workflows/pet/base.py
+++ b/petprep/workflows/pet/base.py
@@ -694,7 +694,7 @@ def init_pet_wf(
     ds_pet_tacs = pe.Node(
         DerivativesDataSink(
             base_directory=petprep_dir,
-            suffix='timeseries',
+            suffix='tacs',
             seg=config.workflow.seg,
             desc='preproc',
             allowed_entities=('seg',),
@@ -715,7 +715,7 @@ def init_pet_wf(
             ('outputnode.segmentation', 'inputnode.segmentation'),
             ('outputnode.dseg_tsv', 'inputnode.dseg_tsv'),
         ]),
-        (pet_tacs_wf, ds_pet_tacs, [('outputnode.timeseries', 'in_file')]),
+        (pet_tacs_wf, ds_pet_tacs, [('outputnode.tacs', 'in_file')]),
     ])  # fmt:skip
 
     if config.workflow.ref_mask_name:
@@ -728,7 +728,7 @@ def init_pet_wf(
         ds_ref_tacs = pe.Node(
             DerivativesDataSink(
                 base_directory=petprep_dir,
-                suffix='timeseries',
+                suffix='tacs',
                 seg=config.workflow.seg,
                 desc='preproc',
                 ref=config.workflow.ref_mask_name,
@@ -747,7 +747,7 @@ def init_pet_wf(
         workflow.connect([
             (pet_t1w_src, pet_ref_tacs_wf, [(pet_t1w_field, 'inputnode.pet_anat')]),
             (pet_fit_wf, pet_ref_tacs_wf, [('outputnode.refmask', 'inputnode.mask_file')]),
-            (pet_ref_tacs_wf, ds_ref_tacs, [('outputnode.timeseries', 'in_file')]),
+            (pet_ref_tacs_wf, ds_ref_tacs, [('outputnode.tacs', 'in_file')]),
         ])  # fmt:skip
 
     if nvols > 1:  # run these only if 4-D PET
diff --git a/petprep/workflows/pet/fit.py b/petprep/workflows/pet/fit.py
index 9a1444ac..24366b1c 100644
--- a/petprep/workflows/pet/fit.py
+++ b/petprep/workflows/pet/fit.py
@@ -468,7 +468,7 @@ def init_pet_fit_wf(
         ds_ref_tacs = pe.Node(
             DerivativesDataSink(
                 base_directory=config.execution.petprep_dir,
-                suffix='timeseries',
+                suffix='tacs',
                 seg=config.workflow.seg,
                 desc='preproc',
                 ref=config.workflow.ref_mask_name,
diff --git a/petprep/workflows/pet/ref_tacs.py b/petprep/workflows/pet/ref_tacs.py
index e29d2c7a..a50ab096 100644
--- a/petprep/workflows/pet/ref_tacs.py
+++ b/petprep/workflows/pet/ref_tacs.py
@@ -27,7 +27,7 @@ def init_pet_ref_tacs_wf(*, name: str = 'pet_ref_tacs_wf') -> pe.Workflow:
         niu.IdentityInterface(fields=['pet_anat', 'mask_file', 'metadata', 'ref_mask_name']),
         name='inputnode',
     )
-    outputnode = pe.Node(niu.IdentityInterface(fields=['timeseries']), name='outputnode')
+    outputnode = pe.Node(niu.IdentityInterface(fields=['tacs']), name='outputnode')
 
     resample_pet = pe.Node(
         Function(
@@ -57,7 +57,7 @@ def init_pet_ref_tacs_wf(*, name: str = 'pet_ref_tacs_wf') -> pe.Workflow:
                     ('ref_mask_name', 'ref_mask_name'),
                 ],
             ),
-            (tac, outputnode, [('out_file', 'timeseries')]),
+            (tac, outputnode, [('out_file', 'tacs')]),
         ]
     )
 
diff --git a/petprep/workflows/pet/tacs.py b/petprep/workflows/pet/tacs.py
index 39541058..6d1f36a4 100644
--- a/petprep/workflows/pet/tacs.py
+++ b/petprep/workflows/pet/tacs.py
@@ -30,7 +30,7 @@ def init_pet_tacs_wf(*, name: str = 'pet_tacs_wf') -> pe.Workflow:
         niu.IdentityInterface(fields=['pet_anat', 'segmentation', 'dseg_tsv', 'metadata']),
         name='inputnode',
     )
-    outputnode = pe.Node(niu.IdentityInterface(fields=['timeseries']), name='outputnode')
+    outputnode = pe.Node(niu.IdentityInterface(fields=['tacs']), name='outputnode')
 
     # Resample PET to segmentation space
     resample_pet = pe.Node(
@@ -68,7 +68,7 @@ def init_pet_tacs_wf(*, name: str = 'pet_tacs_wf') -> pe.Workflow:
                     ('metadata', 'metadata'),
                 ],
             ),
-            (tac, outputnode, [('out_file', 'timeseries')]),
+            (tac, outputnode, [('out_file', 'tacs')]),
         ]
     )