recognize and know where to find anatomic landmarks. This course is by far the most advanced course I have ever taken. The level of knowledge Bill teaches
The frequency of CBCT depends on the IGRT protocol used [1]. Online or offline protocols can be used, depending on the protocol of the institute. At our institute, we routinely use the extended no action level (e-NAL) offline protocol. With this procedure, we use CBCTs in the first thr...
These images are displayed at window (width and level) settings of (1100, 500) HU. Full size image Figure 10 shows a visual inspection of the CBCTs generated by the post-processing approach of applying NLTV to the FDK reconstructed image. In addition, it depicts the proposed method, i.e...
With the change in the air-fluid level in the maxillary sinus, the normally radiolucent maxillary sinus will appear more radiopaque20. In addition to Lana et al.20 who found partial or total opacification in the maxillary sinus at a rate of 1.8%, Rege et al.41 reported this rate as 7.8...
32; display window/level (DW/DL): 1000/200). 3.C. CB artifact rendered via longitudinal data truncation CB artifacts due to data insufficiency or inconsistency occur even if the detector for data acquisition is ideal (i.e., of infinite dimension and sampling rate). From now on, we ...
The 95% CI of those coefficients were calculated by applying a hierarchical percentile bootstrap on the patient- and rater-level, in order to respect the structure of the data [32]. P values were computed by inverting those CI. Fig. 2 Classification of the course of the IAN/MC (indicated...
Visible are the two most distal GTVs (blue and green) the 35 Gy dose level (red). Geometrical variations, causing independent motion of the targets, would have led to under-dosage (V35Gy of 8.9%) of the distal GTV (blue) when using the CBCT-linac plan in the pre-delivery situation ...
seen on the pseudo-panoramic view; the poor positioning of the patient when performing the orthopantomography limits the analysis of the exam and, in turn, the comparison with the CBCT at this level may not be fair due to the poor performance of the exam on the panoramic radiograph [28]...
One of the biggest current challenges is the development of an accurate method for assessing whether the dose deviation exceeds the tolerance level during the course of treatment. A CT simulator is the gold standard modality for treatment planning and dose calculation in radiotherapy. It produces a...
It is important to keep in mind that the ease of performing segmentation can also depend on the specific needs and requirements of the user, such as the type of medical imaging being used, the intended use of the segmented image, and the level of accuracy needed. It may be necessary to ...