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The diagnostic study of choice for kidney cancer is a CT scan. This imaging method provides detailed cross-sectional images of the kidneys and surrounding structures, allowing for better visualization of renal masses, vascular involvement, and potential metastases. The CT scan can also help in staging the cancer, which is crucial for determining the appropriate management and treatment options.

Comparatively, while X-rays can identify some abnormalities, they lack the sensitivity and specificity necessary for definitive diagnosis of kidney tumors. Ultrasound is often used for initial evaluation due to its availability and lack of radiation, but it may not adequately characterize lesions or provide detailed anatomical information needed for staging. MRI, although valuable in certain clinical situations, is generally not the first-line imaging choice for kidney cancer due to its higher cost, longer acquisition time, and limited availability in some settings. Thus, the CT scan stands out as the most effective and widely used modality in diagnosing kidney cancer.