An imaging system comprising: a transport system comprising a conveyor, to transport an object into the imaging system; an X-ray source configured to emit a conical beam of X-ray radiation at a plurality of points along a trajectory of at least 180° around the conveyor on a helical scan path relative to a direction of transport of the object, to irradiate at least a portion of the object; a detector array having a detector height to detect measurement data indicative of an interaction of the X-ray radiation with the portion of the object, the detector array disposed relative to the X-ray source to detect the measurement data along the helical scan path; and a processing unit having a central processing unit programmable to: operate the imaging system in one of a first mode or a second mode: wherein in the first mode the transport system transports the object at a first speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is sufficient for complete pi-line coverage; and wherein in the second mode the transport system transports the object at a second speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is insufficient for complete pi-line coverage due to the second speed of traversal of the object relative to the helical scan path of the conical beam; and compute reconstructed volumetric data representative of a volume of the object by applying at least one iteration of an iterative reconstruction methodology to the measurement data to derive the reconstructed volumetric data. a transport system comprising a conveyor, to transport an object into the imaging system; an X-ray source configured to emit a conical beam of X-ray radiation at a plurality of points along a trajectory of at least 180° around the conveyor on a helical scan path relative to a direction of transport of the object, to irradiate at least a portion of the object; a detector array having a detector height to detect measurement data indicative of an interaction of the X-ray radiation with the portion of the object, the detector array disposed relative to the X-ray source to detect the measurement data along the helical scan path; and a processing unit having a central processing unit programmable to: operate the imaging system in one of a first mode or a second mode: wherein in the first mode the transport system transports the object at a first speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is sufficient for complete pi-line coverage; and wherein in the second mode the transport system transports the object at a second speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is insufficient for complete pi-line coverage due to the second speed of traversal of the object relative to the helical scan path of the conical beam; and compute reconstructed volumetric data representative of a volume of the object by applying at least one iteration of an iterative reconstruction methodology to the measurement data to derive the reconstructed volumetric data. operate the imaging system in one of a first mode or a second mode: wherein in the first mode the transport system transports the object at a first speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is sufficient for complete pi-line coverage; and wherein in the second mode the transport system transports the object at a second speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is insufficient for complete pi-line coverage due to the second speed of traversal of the object relative to the helical scan path of the conical beam; and wherein in the first mode the transport system transports the object at a first speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is sufficient for complete pi-line coverage; and wherein in the second mode the transport system transports the object at a second speed such that the advance of the object relative to the helical scan path divided by the detector height results in collection of measurement data that is insufficient for complete pi-line coverage due to the second speed of traversal of the object relative to the helical scan path of the conical beam; and compute reconstructed volumetric data representative of a volume of the object by applying at least one iteration of an iterative reconstruction methodology to the measurement data to derive the reconstructed volumetric data.