Currently, the most often used imaging modality in emergency radiology is computed tomography (CT) imaging [3, 6, 10, 11].
In clinical practice and as required in chemotherapeutic drug trials, contrast-enhanced computed tomography (CT) is the most often used imaging modality because of its availability, robustness, and the ability to scan the abdomen and chest in one setting.
Other commonly used modalities such as ultrasound, conventional sialography and positron emission tomography (PET) will be presented in order to illustrate findings on different modalities; often, pathology of these spaces may be discovered on exams performed for other reasons.
With constant pressure to cut costs where possible without causing harm to the patient, US is often used as the primary modality for the workup of appendicitis.
Although, colonic diverticulitis is easily diagnosed and classified (graded) by CT than by ultrasound (US), it is important to be aware of the US signs of diverticulitis considering that US is often used as a first modality in the diagnostic approach to the acute abdomen.
However, cryptic species often use sensory modalities that humans do not readily perceive, such as pheromones [ 57, 58], toxicity resistance [ 59] and imperceptible song differences [ 60].
Due to the protracted natural history of the clinical progression of prostate cancer, biochemical recurrence (BCR) is often used to compare treatment modalities.
18F-fluoro-deoxyglucose (FDG) positron emission tomography (PET) is another imaging modality often used during the course of 90Y-ibritumomab tiuxetan therapy [10,11].
Until the 1990s in the prechemotherapy era, radiation therapy was often used as a single modality in the treatment of HL with more extended fields and higher doses than in current radiotherapy techniques [40].
