The phrase "an essential modality" is correct and usable in written English.
It can be used in contexts where you are discussing a necessary or fundamental method, approach, or mode of operation in a particular field or subject.
Example: "In the study of human communication, understanding nonverbal cues is considered an essential modality."
Alternatives: "a crucial method" or "a fundamental approach."
Radiotherapy, an essential modality in cancer treatment, frequently induces fibrotic processes in the skin, including accumulation of extracellular matrix.
Radiation therapy is an essential modality in the treatment of breast cancer.
Positron emission tomography/computed tomography (PET/CT) combining with the functional F-18 fluoro-2-deoxyglucose (F-FDG) PET scan and the anatomical CT scan has become an essential modality for detecting tumors, planning radiation treatment, and evaluating response to therapy [ 1– 3].
Despite aggressive efforts to increase autogenous fistula prevalence primarily from recommendations by the NKF and the Fistula First National Vascular Access Improvement Initiative, catheters remain an essential access modality for a large percentage of the hemodialysis population.
4 Vitamin D recommendation is an essential treatment modality for osteoporosis.
Optical coherence tomography (OCT) has proven to be an essential imaging modality for ophthalmology and is proving to be very important in neurology.
Radiation therapy is an essential therapeutic modality in the management of a wide variety of tumors, but its immediate and delayed side effects on the normal tissues limit the effectiveness of the therapy (Grdina et al. 2002).
Despite improved techniques in neurosurgery and advances in chemotherapy, radiation therapy (RT) remains an essential treatment modality for malignant brain tumors, as well as for central nervous system (CNS) involvement of leukemia and lymphoma.
The comparison between groups that developed and did not develop PEP is described in Table 4. ERCP has become an essential therapeutic modality for pancreatic and biliary diseases since the introduction of endoscopic sphincterotomy [ 20].
This strategy is indirect, because hyperglycemia reflects the consequence of the metabolic derangement, not the cause; however, until the underlying molecular pathophysiology of the disease is identified, measurement of glycemia is likely to remain an essential diagnostic modality.
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